chris rahn mtg cards Explore art: Karn, Living Legacy - Dominaria

If it's a creature, it becomes a copy of The Flood of Mars

Box Toppers There are region-specific Box Topper cards in Streets of New Capenna

Elspeth, Storm Slayer Elspeth, Storm Slayer is one of the best Elspeths and it's easy to see why

I think this is really strong as you can send out a card you no longer care about, (such as a land) or if you can recur it (such as said land when you control a Ramunap Excavator and you can just replay it)

You could also consider including Purphoros, God of the Forge in your deck to make it so that whenever another creature enters the battlefield under your control you can deal two damage to each opponent