(Some abilities can also target unexerted cards.) But not using them has less of a direct benefit - you dont need to defend your life points, as in MTG or Yu-Gi-Oh!, so leaving cards upright is typically only worthwhile if theyre likely to be challenged by your opponent and you need them for a future turn
Parallel Lives: Adds redundancy for token-heavy builds
Use the sacrificed creature's power as it last existed on the battlefield to determine how much damage Fling deals
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With all of these options, it goes without saying that there are going to be a lot of different ways to build a delirium deck
A more recent innovation was the realization that we could just include activation instructions of a modal activated ability up front, before the modes themselves