Merfolk Sovereign

+1: You gain 2 life. −1: Put a +1/+1 counter on each creature you control. Those creatures gain vigilance until end of turn. −6: Create a white Avatar creature token. It has "This token's power and toughness are each equal to your life total."

You gain 7 life.

Enchant creature Enchanted creature gets +1/+1 for each Plains you control and has flying.

Flying, first strike, lifelink, protection from Demons and from Dragons

W, T: Tap target creature.

Vigilance (Attacking doesn't cause this creature to tap.) Other Soldier creatures you control get +1/+1 and have vigilance. When this creature enters, create three 1/1 white Soldier creature tokens.

Exile target black or red permanent.

Destroy target attacking or blocking creature.