If a permanent enters the battlefield under an opponent's control with hexproof, indestructible, protection, shroud, and/or ward after Shay Cormac's first ability resolves, it won't lose that ability until you activate Shay Cormac's first ability again
Regardless of what cards were added in the flex slots, the deck won by playing out a massive number of creatures, attacking with them, and then sacrificing them to drain out their opponents with [card]Blood Artist[/card] triggers, amass an army of flying demons courtesy of [card]Skirsdag High Priest[/card], or just create a giant [card]Voice of Resurgence[/card] token to bash their opponent to death with
Mordant Dragon an older Dragon I overlooked when building the deck
I guess, whenever a creature enters the battlefield under my control, I can put a token card somewhere and reveal it and then I can put the converted mana cost which is zero on the token
Did I miss any that you think should be here, or on the flip side, did I list an undeserving shifter