Fire-Eater Frog

{1}: The next time a red instant or sorcery spell would deal damage to any target this turn, prevent 1 of that damage. If damage is prevented this way, put a +1/+1 counter on Fire-Eater Frog. Activate this ability only once each turn.
Remove a +1/+1 counter from Fire-Eater Frog: Fire-Eater Frog gets +2/+0 until end of turn.