At minimum, you want penny sleeves (thin plastic sleeves), toploaders or card savers (rigid holders), team bags, and stiff cardboard mailers
A deck that uses Pitiless Plunderer only needs to sacrifice a token creature or use one as a chump blocker, and thats just the first synergy that comes to mind
Whenever you scry, tap up to X target nonland permanents, where X is the number of cards looked at while scrying this way
Best MTG First Strike Cards Mirri, Cat Warrior (Green First Strike Creature) [c]Mirri, Cat Warrior[/c], is a fantastic green legendary creature with first strike
Interaction between copying and abilities with limited uses per turn Karador, Ghost Chieftain Legendary Creature Centaur Spirit This costs less for each creature card in your graveyard
There are a lot of very good cards in the Modern Horizon 3 expansion, and many of these cards synergize with having creatures in the discard pile