A card I dont think has had the chance to shine yet is Rammas Echor, Ancient Shield
This has not been announced for Gateway , however
Throw some support around Squall, and your efforts will be paid off
While the others may affect the board in more significant ways, since a card can represent various threats at various times, drawing or discarding simply has more of an effect than even more seemingly powerful effects like dealing one AOE damage to your opponents board
See why this is my penultimate card
While this decks enchantments are resilient to most board wipes, cards like Ondu Inversion and Farewell exist, and you do build out a board of creatures, so protective spells are a must