Writhing Necromass

This spell costs {1} less to cast for each creature card in your graveyard.
Deathtouch

Molten Monstrosity

This spell costs {X} less to cast, where X is the greatest power among creatures you control.
Trample

Glowspore Shaman

When this creature enters, mill three cards. You may put a land card from your graveyard on top of your library. (To mill a card, put the top card of your library into your graveyard.)

Experiment One

Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)
Remove two +1/+1 counters from this creature: Regenerate it. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Crimson Fleet Commodore

Trample
When this creature enters, you become the monarch.

Gurmag Angler

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

Putrid Leech

Pay 2 life: This creature gets +2/+2 until end of turn. Activate only once each turn.