Flaming Sphere

{x}{r}{r}: Flaming Sphere deals X damage to target creature or player where X is the mana cost to activate this ability; activate this ability only once per turn as a sorcery.
On your Combat Step, Flaming Sphere is an enchantment creature with power and toughness X, where is is the number of sorceries in your graveyard up to a maximum of 4; if you control a Geleran, Druid of the Moon, it's power and toughness becomes 5/5.