pokemon cards gx mewtwo style setup or your main portfolio Mewtwo GX - 39/73 -

Invasion of Shandalar / Leyline Surge Invasion of Shandalars effect is a decent enough recursion spell, but if you manage to transform it (and keep Leyline Surge from being destroyed) you can cheat any one permanent in your hand onto the battlefield per turn, which can be absurdly good

there are many different directions you can take token decks, and theyre all reasonably viable

You just get a giant dinosaur to go along with your card advantage, and combining the pressure of a 6/6 with your card draw is nearly as strong as pairing it with ramp

Path to Exile without a drawback

To put it bluntly, because you want to win the game