Its a shame to see this mode of duel limited so harshly here, as it is only playable in story mode with select characters, there are only around 70 supporting cards for it, and its not playable online at all
9 Sheoldred, Whispering One Sheoldreds First Printing Packs A Wallop During Upkeeps The first printing of Sheoldred might lack the utterly maddening qualities of its current-day Standard counterparts (especially the omnipresent Sheoldred, the Apocalypse), but it still features not one, but two hugely powerful upkeep abilities
In the Crimson Vow and Midnight Hunt s Standard there is really only Arlinn, the Pack's Hope as a way to cast creatures at instant speed, but it is on the opposite side of the color pie as disturb so you'll need to look into other sets to abuse this interaction
Its longevity and devoted player base have kept it going strong for decades
Copying auras is another way to get great value
What monster could be more reliable than the four that are summoned when the spell card Scapegoat is played