The other possibility is playing Invasion of Regatha in a dedicated burn deck since the backside seems pretty powerful with Play with Fire, Lightning Strike, and friends as a weird twist on Torbran, Thane of Red Fell, although I'm not sure a burn deck wants to use multiple burn spells or attacks to remove the five defense counters to defeat the battle
The circles are made the same way you made the rectangles
However, while Karn is as potent a threat as ever in Modern Tron, Tron simply hasnt kept up with Moderns development and is no longer the Tier 1, format-defining archetype it once was
Either way, this has been massively helpful
FAQ What Types Of Cards Should Be In The Pokmon Cube
While these three archetypes do have plenty of overlap, its easy to build distinct decks supporting each theme