Mana-Charged Dragon

Mana-Charged Dragon

Creature - Dragon | Power/Toughness: 5 / 5 (CMC 6)
Flying, trample
Join forces -- Whenever Mana-Charged Dragon attacks or blocks, each player starting with you may pay any amount of mana. Mana-Charged Dragon gets +X/+0 until end of turn, where X is the total amount of mana paid this way.