Because damage remains marked on a creature until damage is removed as the turn ends, damage previously dealt to a creature with indestructible may cause it to be destroyed if Shay Cormac's first ability resolves later during that turn
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Starting at anywhere from 25 to 30 is a good idea
As a card advantage machine that's uncounterable and hard to remove from the board, it's great in all assortment of creature decks, especially token-flavored ones
Here I'll list some cards that I think could potentially fit into this deck, though by no means is it exhaustive, because the nature of Standard is such that it's extremely hard to predict and evaluate things early on
Rare Candy is the Sword & Shield equivalent