As a note, this event does use Event Stamina, so players can only defeat decks so many times a day for a chance at earning rewards
That means it pairs well with Charizard [Pokemon Go] and the upcoming Charizard ex [Pokemon 151]
tap it to gain control of target creature
re-triggering an EtB effect on your own cards, untapping a land to gain an extra mana on your opponent's turn, giving a creature psuedo vigilance, killing a token, resetting planeswalker loyalties, preventing a creature from blocking, resetting a level up, evolve or otherwise growing on investment creature, unflipping flip cards, regaining control of stolen cards, refreshing depletion cards such as the new sagas, lowering a land count periodically to empower effects like Tithe, and possibly some more
Should You Buy a Lost Abyss Booster Box