Reality Gem, Infinity Stone

When Reality Gem, Infinity Stone comes into play, you may change an aspect of the game
using {x}, while the Reality Gem, Infinity Stone
is in play. (ie, Draw{x}cards, Play{x}lands, Gain{x}life, etc). {x} equals mana played to cast.
{t}{x}: May draw {x}Planes Card and play 1 immediately; you may keep up to 3 Planes and play 1 Plane at the beginning of your turn.
If Reality Gem, Infinity Stone is ever Destroyed , then Destroy all Infinity Stones in play, in all hands, & in all graveyards, & remove all