Caulder, The Mad Scientist

When Caulder enters the battlefield, all creatures you control get +5/+5 until end of turn.

When a creature you control with toughness 10 or greater is destroyed, you may cast a spell from your hand. You may pay {2}{r}{b}{u} instead of paying its mana cost.

{p/b}{p/r}{p/u}: All creatures you control get +0/+2 until end of turn.