Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, target opponent loses 2 life and you gain 2 life.

(Gain the next level as a sorcery to add its ability.)
When this Class enters, create a 2/2 green Wolf creature token.
: Level 2
Whenever you attack, put a +1/+1 counter on target attacking creature.
: Level 3
You may look at the top card of your library any time.
You may cast creature spells from the top of your library.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)
When this creature enters, create two 1/1 colorless Thopter artifact creature tokens with flying.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Sacrifice this enchantment: Target creature gets +3/+3 until end of turn.

Whenever you gain life, put a +1/+1 counter on this creature.

Lifelink
Enchantment spells you cast cost less to cast.

When this enchantment enters, exile target creature an opponent controls with mana value 3 or less until this enchantment leaves the battlefield.
Whenever an opponent casts a Vampire spell with the same name as a card exiled with this enchantment, you gain 2 life.

When this creature dies, target opponent discards a card.

Whenever a player taps a snow land for mana, that player adds one mana of any type that land produced. That land doesn't untap during its controller's next untap step.

, : This creature deals 3 damage to target attacking or blocking creature. This creature doesn't untap during your next untap step.

Sacrifice this creature: Target creature gets -1/-1 until end of turn.
Soulshift 4 (When this creature dies, you may return target Spirit card with mana value 4 or less from your graveyard to your hand.)

Vigilance
Whenever this creature deals damage to a Goblin or Orc, destroy that creature.

Destroy target nonblack creature if its toughness is less than or equal to the number of cards in your graveyard.

Creatures you control get +2/+2 until end of turn.

Counter target spell unless its controller pays . Clash with an opponent. If you win, that spell's controller mills four cards. (Each clashing player reveals the top card of their library, then puts that card on their choice of the top or bottom. A player wins if their card had a greater mana value.)

( can be paid with either or .)
, Sacrifice a land: This creature deals 2 damage to target player or planeswalker.
: Target creature gets +2/+2 until end of turn.

When this creature enters, you may exile another target creature.
When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control.

When this creature enters, it deals 1 damage to each of up to two target creatures.
: Transform this creature.

This creature can't be blocked.
When this creature enters, you gain 4 life.
When this creature enters, sacrifice it unless was spent to cast it.