Phyrexia: All Will Be One Phyrexia: All Will Be One introduced a tweaked version of the living weapon mechanic from Mirrodin Besieged
It also gains the activated abilities of whichever goblin rests atop your humble deck - which means that it can serve as an extra copy of whatever you want it to be, without having to invest the mana first
The standout strength here is mana-to-value conversion
Card Name Mana Cost Type Creature Elemental Rarity Mythic Rare rules Text Reach (This creature can block creatures with flying.) You may play lands from your graveyard.If a land entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time
Still, even without the energy use Im giving it serious consideration for my Feather the Redeemed blink/burn deck
Old One Eye Something something big dumb creatures oh wait, Old One Eye is a big dumb creature and creates another big dumb creature when it enters, can buy itself back later in the game, and gives all of your creatures trample