It generates two treasure tokens whenever you deal combat damage to an opposing player, but for one mana, it also lets you sacrifice treasure tokens to reduce a target creature's power and toughness by that amount
Unlike almost all the other cheat in cards on this list these are efficient enough that it is plenty good enough just swapping around filler and midrange utility stuff for value
Creatures with suspend gain haste when cast this way, allowing immediate attack or use
I had cards for the old, short-lived Digimon card game as a kid, but the rules have been completely reworked since then
You will rarely find them in Play boosters, but always find one in a Collector booster
You can pull off various combo shenanigans in Urza, Lord High Artificer and Emry, Lurker of the Loch decks, especially when coupled with a card like Mirran Spy