In a war for survival, Dominaria itself became a weapon
Red Red is the color of fury, fire, brutality, and chaos
You could combine it with cards like Bristlebane Battler to make more saprolings (or even better, to leech from an opponent that has that card and kill it later by doubling its counters)
There may not be an MTG Arena code for March of the Machine - but there are still plenty of free packs and other goodies to snap up
He acts as a board wipe and a win condition, and is up there with the best colorless cards MTG players should pick up if they plan on running a colorless-centric deck
Pair Queen of Hearts, Capricious Monarch with Kronk, Junior Chipmunk to make the most of the banishing spree