Insectoid Exterminator

When this creature leaves the battlefield, create a Mutagen token. (It's an artifact with "1, T, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")

Sneak R (You may cast this spell for R if you also return an unblocked attacker you control to hand during the declare blockers step.) Jennika's Technique deals 2 damage to each creature.

Flash When this artifact enters, target creature gets +2/+2 until end of turn. Untap it. 2, T, Sacrifice this artifact: You gain 3 life.

Enchant basic land you control When this Aura enters, exile target creature an opponent controls until this Aura leaves the battlefield.

When this artifact enters, destroy target creature. 2, T, Sacrifice this artifact: You gain 3 life.

(T: Add B.)

(T: Add G.)

When this creature enters, create a Mutagen token. (It's an artifact with "1, T, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")