This spell costs {3} less to cast if a creature died this turn. Flying, deathtouch

Iron Apprentice enters the battlefield with a +1/+1 counter on it. When Iron Apprentice dies, if it had counters on it, put those counters on target creature you control.

When Kjeldoran Dead enters the battlefield, sacrifice a creature. {B}: Regenerate Kjeldoran Dead.

When Myr Retriever dies, return another target artifact card from your graveyard to your hand.

As an additional cost to cast this spell, sacrifice an artifact or creature. Draw two cards and create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.")

Target creature gets -1/-1 until end of turn for each Swamp you control.

If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost. Destroy target nonblack creature. It can't be regenerated.

Put a +1/+1 counter and a lifelink counter on target creature.

Choose one — • Target opponent reveals their hand. You may choose a creature, enchantment, or planeswalker card from it. That player discards that card. • Target opponent sacrifices an enchantment.