Xelessa, Blade-Angel

+1: Target creature you control gains first strike and lifelink until end of turn.
-1: Creatures you control gain double-strike and +X/+Y until end of turn where X is the number of Mountains and Y is the number of Plains you control
-6: Create a 2/2 Red and White Angel creature token with Trample, Parry, and "When this creature deals combat damage to a player, you win the game.