Sacrifice a creature: Add {C}{C}.

{T}: Add {G}. When you spend this mana to cast a Dragon creature spell, it enters the battlefield with an additional +1/+1 counter on it and gains hexproof until your next turn. (It can't be the target of spells or abilities your opponents control.)

At the beginning of your end step, put a +1/+1 counter on target Beast creature you control.

Sacrifice Aerie Ouphes: It deals damage equal to its power to target creature with flying. Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

{3}: Target Soldier gains flying until end of turn.

Changeling (This card is every creature type.) {T}: Target creature gains all creature types until end of turn. {T}: Target creature loses all creature types until end of turn.

{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Trample Whenever Aurochs attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.

Trample When Aurochs Herd enters the battlefield, you may search your library for an Aurochs card, reveal it, put it into your hand, then shuffle. Whenever Aurochs Herd attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.

Whenever a Beast becomes blocked, it gets +1/+1 until end of turn for each creature blocking it.

When Biomathematician enters the battlefield, create a 0/0 green and blue Fractal creature token. Put a +1/+1 counter on each Fractal you control.

Tap two untapped Elves you control: Add one mana of any color. Morph {G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Treefolk spells and Shaman spells you cast cost {1} less to cast.

Defender (This creature can't attack.) Flying Transmute {1}{U}{U} ({1}{U}{U}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

When Dripping-Tongue Zubera dies, create a 1/1 colorless Spirit creature token for each Zubera that died this turn.

{T}, Exile a Treefolk card from your graveyard: Search your library for up to two Forest cards, put them onto the battlefield tapped, then shuffle.

When Floating-Dream Zubera dies, draw a card for each Zubera that died this turn.

Changeling (This card is every creature type.) Trample

All Slivers have "{T}: Add one mana of any color."

{G/U}, Sacrifice Grazing Kelpie: Put target card from a graveyard on the bottom of its owner's library. Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Changeling (This card is every creature type.) When Guardian Gladewalker enters the battlefield, put a +1/+1 counter on target creature.

Changeling (This card is every creature type.) When Littjara Kinseekers enters the battlefield, if you control three or more creatures that share a creature type, put a +1/+1 counter on Littjara Kinseekers, then scry 1.

Changeling (This card is every creature type.) When Masked Vandal enters the battlefield, you may exile a creature card from your graveyard. If you do, exile target artifact or enchantment an opponent controls.

Changeling (This card is every creature type.) Flying {1}{U}: Mistwalker gets +1/-1 until end of turn.

Changeling (This card is every creature type.) Tap an untapped creature you control: Mothdust Changeling gains flying until end of turn.

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on Petalmane Baku. {1}, Remove X ki counters from Petalmane Baku: Add X mana of any one color.

{T}: Add {G} for each Elf on the battlefield.

{T}: Add {G}. When you spend this mana to cast a Dragon creature spell, you gain 2 life.

When Shipwreck Sifters enters the battlefield, draw a card, then discard a card. Whenever you discard a Spirit card or a card with disturb, put a +1/+1 counter on Shipwreck Sifters.

Flash Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Changeling (This card is every creature type.)

Changeling (This card is every creature type.) Reach When Webweaver Changeling enters the battlefield, if there are three or more creature cards in your graveyard, you gain 5 life.

Whenever a Beast enters the battlefield, you may draw a card.

This spell costs {2} less to cast if you control a Dragon. Draw three cards.

Destroy target noncreature permanent. If you control a Treefolk, draw a card.

Target creature gets -4/-0 until end of turn. If you control a Wizard, draw a card.

Draw a card for each Bird on the battlefield.

Put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it. If you control a Merfolk, draw a card.

This spell has flash as long as you control a Merfolk. Return target creature to its owner's hand. Draw a card.

Choose a creature type. Draw a card for each permanent you control of that type.

This spell costs {2} less to cast if you control a Human creature and a non-Human creature. Draw two cards.

Draw a card for each Spirit you control.