Scream

Symbiosis {5}{b} ({5}{b}: This card becomes an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)

Discard a creature card: Scream gets +2/+2 until
end of turn. If Scream is an Aura, enchanted creature gets +2/+2 until end of turn instead.

Enchanted creature gets +3/+3