Floodtide Serpent

You draw X cards and you lose X life, where X is your devotion to black. (Each B in the mana costs of permanents you control counts toward your devotion to black.)

Tribute 6 (As this creature enters, an opponent of your choice may put six +1/+1 counters on it.) When this creature enters, if tribute wasn't paid, you may have this creature fight another target creature. (Each deals damage equal to its power to the other.)

Enchant creature Enchanted creature has "1W, T: You gain 3 life."

Heroic — Whenever you cast a spell that targets this creature, gain control of another target creature until end of turn. Untap that creature. It gains haste until end of turn.

Counter target creature or Aura spell.

Enchant creature Enchanted creature has "T: Scry 1, then draw a card." (To scry 1, look at the top card of your library, then you may put that card on the bottom.)

Flying This creature can't attack or block alone.

All creatures get -2/-2 until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)