It can give a creature islandwalk to sneak past an opponent with islands, shrink something by -1 toughness while adding +2 power to push through damage, or even force a player to discard a card
In fact, the cost per card for this product is quite low $0.63 each for 16 cards, which is lower than the on-demand proxies sold by MTGProxy
Of course, you need your own creatures in play to fight something, but that wont be difficult for a green deck to achieve
Being able to make an opponent sacrifice a creature can, on turn two or three, leave them with nothing to attack with, helping her stick around for longer
Taking two turns in a row is undoubtedly incredibly powerful, especially in a format where two- and three-prize Pokmon make up the bulk of attackers
they kind of all need to be here