Rayquaza

Flying. Vigilance.
All creatures that enter the battlefield with a power
stat higher than Rayquaza, Protector of Hoenn's
power cannot activate their abilities.
Abilities include effects that trigger on
attack, block, enter the battlefield, leave the battlefield
and pay x mana to activate.
{3}{t} All your creatures are unaffected by
Rayquaza's effect until your next upkeep.
You may choose to replace this with Mega Rayquaza, The Delta once you play Dragon Ascent.