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You still need the requisite loyalty counters to activate abilities, but plus abilities and zero abilities are usable immediately (still just one per turn, though)

If you want to learn more about advanced tactics in sideboarding, I recommend checking out this course on Spikes Academy

There are almost never 99 attackers involved in a game of MTG, so this is a truly formidable feat

Making your opponent discard when it enters while just being a large flying threat puts on a fantastic amount of pressure and means this is always at worst at two-for-one

Notion Thief While its no Hullbreacher, this card remains quite powerful