mtg curse cards of Misfortunes [Dark Ascension] that player reveals cards from the top of their library until they reveal a creature card Curse of Vengeance

Not only do you cause a blowout by countering whatever your opponent intended, you also get to set them or another player further back when you redirect the targets

Mordenkainen Mordenkainen is a planeswalker whose ultimate ability switches your hand with your library and gives you an emblem that lifts your max hand size restriction

Note that things chosen to proliferate get one more of each type of counter they already have you can choose the players and objects, but you cant choose which counters get proliferated

I was gushing over Scavenger Grounds three years ago when I started writing content, and I wont stop now