Sapling of Colfenor attacks and you draw a card and gain some life in the process as long as you put creatures with higher toughness than power in your deck, which youre already doing anyways
Adeline, Resplendent Cathar is actually most known for its role in the Pioneer Humans archetype since its rotated out of Standard
Thankfully there are other decks that are keeping Mardu Pyromancer down these days, but that could change if U/W Spirits starts to see the spotlight
When you start casting your big X spells, youll also get big X/X hydras, and Sultai colors already have excellent X spells that you want to cast at different points in the game
Hellkite Tyrant Controlling 20 artifacts is no easy feat, even if youre playing affinity with all artifact lands at your disposal
That said, I think the art on lands is an excellent and sometimes overlooked element that can really set the aesthetic tone of a deck