Grumblo, Vanguard Captain

First-Strike
Legendary creatures that enter the battlefield
while Grumblo is on the battlefield gain +2/2
and menace until the end of your turn.
{x}{g}{g}{g}{t} Grumblo turns into J’zargo and
gains +3/3, Hexproof and Double-Strike for X
amount of rounds where X is the amount of mana
spent.