I think Commander would be the best place to start
Whenever Graveyard Glutton enters the battlefield or attacks, exile up to two target cards from graveyards
Legolass Quick Reflexes The perfect time for Legolas's Quick Reflexes is when your creature gets targeted right before your combat step, so that attacking triggers the ability it gives the creature
Kotis sidesteps this because it becomes your central win condition, and the theft is an upside to stacking counters, auras, equipment, or other buffs on the indestructible creature
Note that this doesn't affect spells on the stack
Challenge : If your opponent has an exerted character card (from questing, using abilities, or other effects) then you can challenge them by exerting your characters on your turn