Many of your gold and gem purchases go through the MTG Arena store which is one of the main ways you can get cards in MTGA
For example, Beast, Frustrated Designer can Banish two item cards and deal five damage to another character
That requires a few extra lands in play for Fabled Passage, but you can usually work around that restriction
Talk about a self-insert
To that end, there are big spells in here, like Maelstrom Wanderer, Omnath, Locus of Rage, Titan of Industry, and more, all of which can be used to grab big ETB triggers to keep opponents on their toes.
That's a lot, but it can be reduced by tapping any number of creatures