Great Serpent

Vigilance, Menace, Trample, Toxicity (It has deathtouch during your turn.)

When Great Serpent enters the battlefield, you may put four -1/+1 counters on it. If you do, it gains First Strike, loses Trample, and replace all instances of Surveil with Scry in Great Serpent abilities.

Whenever Great Serpent attacks, Scry 2, you may reveal these cards. If you do, the next time you cast it this game, you gain life equal to its power, and heal three life on Great Serpent.