(Scryfall note, 2020-07-14) The token created by Nissa's first ability has its power and toughness set only once, at the time the ability resolves
Feast of the Unicorn Flavoring your typical, You have a bigger attack as long as this aura lasts concept has always been a bit odd to me
(Note that if the defending player had only one bear, he could not block the sliver regardless of the provoke because the Two-Headed Sliver is imposing a restriction on blocking, and a restriction always trumps a requirement.) In cases where there are several possible declarations that would obey the same amount of requirements, the defending player can choose between them
If you do, you get two rad counters
It plays a little faster mana, but only to get its big spells under way
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