Glittering Gobstopper

Whenever Glittering Gobstopper attacks, target opponent must recite a limerick about sweets. If they fail, tap all creatures they control.
Glittering Gobstopper has "{t}: All creatures gain your choice of flying, trample, or lifelink until end of turn. Activate this ability only if Glittering Gobstopper has at least three flavors."