Destoroyah, Godzilla's Demise

Flying, Haste, Mutate {2}
When Destoroyah, Godzilla's Demise enters battlefield or attacks choose one.
• {t} Deal 5 damage to target opponent.
• {b/r}{b}{r} Destroy any creature on the board that
has a base toughness less than or equal to 5.
• Pay {x} where {x} is the total amount of
creatures you control, and give them all a
+1/+1 counter.