Improvised Arsenal

Flying When this creature enters, each opponent loses 1 life and you gain 1 life. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

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 Turtles you control get +2/+2.

(T: Add G.)

Menace Whenever another permanent leaves the battlefield, put a +1/+1 counter on Super Shredder.

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.

Whenever this Vehicle attacks, put a +1/+1 counter on target creature that crewed it this turn. Then if that creature is a Mutant, Ninja, or Turtle, double the number of +1/+1 counters on it. Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.)