Tifa's last ability cares about the power of each individual creature that dealt combat damage to a player, not their total power
You can banish this card from your Graveyard, then target 1 Set Spell/Trap Card your opponent controls
Near the end of the game, someone Planar Cleansinged the board, and the Trove left, and by then, the sheer card advantage it gave enabled me to win
Ramp is also really important, and the two are intertwined
When it comes to game design for Magic , there are templates for how to write the card rules, there are red flags whenever a common card is getting overly complex, and everything is incredibly standardized when you come to read their rules they make a point of rewriting all cards on their database whenever a change is made, to make sure everything is on the same ground