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Legends: Arceus cultural staying power

(They can't be blocked except by two or more creatures.) Threshold If there are seven or more cards in your graveyard, creatures can't block this turn

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If the chosen target is an illegal target by the time Zenith Flare tries to resolve, the spell won't resolve

The Oath is somewhat random although the cards you have in hand do give you some information to set up with accordingly

This turn, instead of declaring blockers, each defending player chooses any number of creatures they control and divides them into a number of piles equal to the number of attacking creatures for whom that player is the defending player