For the low, low cost of one card, you get to attack again, draw a card, and use all of your mana a second time, plus get a crack at additional upkeep/end step triggered abilities and all that good stuff
Designed to fit Pokmon, Magic: The Gathering, Yu-Gi-Oh!, and even hockey card packs, these crystal-clear sleeves offer reliable protection without compromising visibility
Like the Lord enchantments from above, this too proved customizable: For flavor reasons (the cards made much more sense when tied to a certain race), only one customizable card of this mechanic was made
Throw cards around
These have always been a thorn in the side of affinity-style decks since they even stop artifacts from tapping for mana, effectively switching Mox Opals and artifact lands off