Alatreon, Blazing Maelstrom

Flying, fear, haste

{2}{u}{t}: Counter target spell or ability an opponent controls. Activate only once each turn.

{x}{r}{t}: Alatreon, Blazing Maelstrom deals X
damage to target creature or player.

{1}{b}{b}{t}: Put a -1/-1 counter on each creature
target player controls, then proliferate.