If you can consistently discard multiple cards in a turn, Monument to Endurance offers a massive windfall
It's a nicely flexible spell that does a great job of protecting more than your creatures
Booster packs will be the primary way of collecting Lorcana, with each pack containing 12 cards
Rather than spending seven mana for it (which, again, is almost never going to happen), we can exile two black cards from our hand (like Chancellor of the Dross) to hit something for four damage and gain four life, making Soul Spike essentially the black Fireblast except costing black cards rather than Mountains
A Tergrid deck doesnt really need any other fancy cards to win with: their opponents rares will be valuable enough
Being able to straight-up cast all the instants and sorceries in your graveyard rather than give them flashback is so, so much more powerful