I've seen people just decide not to cast their second Swords to Plowshares because they had one in the graveyard already
Green Cards are usually used to build ramp decks
'Victory and power at any cost' is the mindset of a black player, as they sacrifice, extort, and drain their way to victory
You have enough resources to kill one of them, but youre afraid that you wont have anything left for the remaining player
Disclaimer: I am not a competitive Lorcana player
Teferi, Master of Time I typically avoid planeswalker ults on lists like this because achieving them is incredibly inconsistent, but Teferi, Master of Times static ability makes it much more reliable than most and all the card filtering helps sculpt the perfect hand for those two extra turns