The way Yanmega ex works is that its Buzz Boost ability lets you search your deck for three Grass Energy and attach it to the card when it switches from the Bench to the Active spot
Rancor gives the enchanted creature +2/+0 and trample, turning even the lowliest 1/1 creature into a 3/1 attacker
For example, Aven Mindcensor limits how much your opponents can search their library, while Thalia, Heretic Cathar turns all their lands into tap lands
Just a week ago this card was only $5
Like this: Mystery Booster is like nothing we've ever done before, and we hope the play experience is fun, exciting, and, yeah, a little bit mysterious
On top of this, you can pay 10 life to untap all lands , but you can only do this once each turn