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It didnt last too long in Legacy before getting slapped with a ban

Put a reach counter on each of them

Or what are the different formats in MTG Arena

Since it sacrifices, you get past protection like indestructible and since you didn't target, hexproof for protection won't help either

And thats not all: remove flying counters from your creatures placed on them by Luminous Broodmoth, slow down the aging of Cumulative upkeep cards, like Mystic Remora (or Blizzard, if you feel like putting flying counters on opponents creatures like a monster), allow Undying creatures to continually un-die the (giant robotic manta in the) skys the limit

With the updated rules, players don't assign blockers until damage is being dealt