mtg play with top card revealed

mtg play with top card revealed Hopefully an easy one: cards like powerbalance, what happens with the if not cast? Do I just put it back on of the library? Thanks! Are there any permanents like

Name: mtg play with top card revealed Hopefully an easy one: cards like powerbalance, what happens with the if not cast? Do I just put it back on of the library? Thanks! Are there any permanents like
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So, theres a reasonable likelihood that well see AC: Shadows characters like Yasuke included somewhere in this trove of cards

Once Jumbo Cactuars 10,000 Needles ability triggers and resolves, you can pay the three mana to sacrifice the Cactuar to Jarad to make each opponent lose 10,000 life