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If you look at the last format prior to a rotation for each of the last few years, it is usually relatively new decks seeing success, with a few exceptions sneaking through, like Regidrago VSTAR

Toxic is a creature mechanic that deals combat damage to a player in two ways: in life based on the creature's power, and N poison counters based on the creature's toxic N attribute

Strike it Rich is a better spell than that, considering you can take advantage of artifact or token synergies, and even spend three mana to cast another spell from the graveyard for incidental value later

Together, these card can tilt the balance of the board in the players favor