If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on it instead.

Endless One enters the battlefield with X +1/+1 counters on it.

Feral Hydra enters the battlefield with X +1/+1 counters on it. {3}: Put a +1/+1 counter on Feral Hydra. Any player may activate this ability.

Enchant creature When Hydra's Growth enters the battlefield, put a +1/+1 counter on enchanted creature. At the beginning of your upkeep, double the number of +1/+1 counters on enchanted creature.

Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on that creature.

Trample Whenever a player casts a spell, put a +1/+1 counter on Managorger Hydra.

Flying Nimbus Swimmer enters the battlefield with X +1/+1 counters on it.

Vastwood Hydra enters the battlefield with X +1/+1 counters on it. When Vastwood Hydra dies, you may distribute a number of +1/+1 counters equal to the number of +1/+1 counters on Vastwood Hydra among any number of creatures you control.

{G}{U}, {T}: Double the number of each kind of counter on target artifact, creature, or land.

Wildwood Scourge enters the battlefield with X +1/+1 counters on it. Whenever one or more +1/+1 counters are put on another non-Hydra creature you control, put a +1/+1 counter on Wildwood Scourge.

Draw four cards, then choose X cards in your hand and discard the rest.

Target player draws X cards and loses X life.

Roll a d20 and add the number of cards in your hand. 1—14 | Draw X cards. 15+ | Scry X, then draw X cards.

When you cast this spell, reveal the top X cards of your library. You may put a nonland permanent card with mana value X or less from among them onto the battlefield. Then shuffle the rest into your library. Genesis Hydra enters the battlefield with X +1/+1 counters on it.

When you cast this spell, you gain half X life and draw half X cards. Round down each time. Flying, trample Hydroid Krasis enters the battlefield with X +1/+1 counters on it.

Draw a card for each creature you control with a +1/+1 counter on it. Those creatures gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)

Trample Lifeblood Hydra enters the battlefield with X +1/+1 counters on it. When Lifeblood Hydra dies, you gain life and draw cards equal to its power.

Draw X cards.

Choose one — • Draw cards equal to the greatest power among non-Human creatures you control. • Non-Human creatures you control get +3/+3 until end of turn.

You may cast Silver Scrutiny as though it had flash if X is 3 or less. Draw X cards.

Target player draws X cards.

{T}: Add one mana of any color in your commander's color identity.

({T}: Add {G}.)

({T}: Add {U}.)

Defender {T}: Creatures you control gain haste until end of turn.

Until end of turn, double target creature's power X times.

{T}: Add one mana of any color in your commander's color identity. Sacrifice Commander's Sphere: Draw a card.

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

{T}: Add {G}.

You may play an additional land this turn. Draw a card.

{1}, {T}: Add {B}{G}.

Draw a card. You may put a land card from your hand onto the battlefield.

As an additional cost to cast this spell, sacrifice a land. Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.

{T}: Add {G}.

Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle. Cycling {2} ({2}, Discard this card: Draw a card.)

Strategic Coordinator — Basic lands you control have "{T}: Add {C}{C}. Spend this mana only on costs that contain {X}."

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

{1}, {T}: Add {G}{U}.

{T}: Add {C}{C}.

You have no maximum hand size. {T}: Add {C}.

Return X target creature cards from your graveyard to your hand.

When Eternal Witness enters the battlefield, you may return target card from your graveyard to your hand.

Put target card from your graveyard on top of your library.

Exile X target creatures. For each creature exiled this way, its controller creates a 2/2 green Boar creature token.

Target creature gets -X/-X until end of turn.

Destroy target creature with mana value X.

Return X target nonland permanents to their owners' hands.

Destroy target nonblack creature.

Vigilance Hydra spells you cast cost {4} less to cast. Whenever a creature you control becomes the target of a spell, Gargos, Vicious Watcher fights up to one target creature you don't control.

Destroy each nonland permanent with mana value X or less.

Destroy all creatures you don't control and all planeswalkers you don't control.

Counter target noncreature spell.

Target creature you control gets +X/+X until end of turn. Then it fights up to one target creature you don't control.

Choose two — • Target player loses X life. • Return target creature card with mana value X or less from your graveyard to the battlefield. • Target creature gets -X/-X until end of turn. • Up to X target creatures gain fear until end of turn. (They can't be blocked except by artifact creatures and/or black creatures.)

Destroy target artifact or creature. It can't be regenerated.

Choose one — • Destroy target artifact. • Destroy target enchantment. • Exile target card from a graveyard.

Exile X target cards from target player's graveyard. For each card exiled this way, that player loses 1 life and you gain 1 life.