A subgame can be created within a subgame. The existing subgame becomes the main game in relation to the new subgame.
April 4, 2025 · Tarkir: Dragonstorm
rule 729.6 not present in this release
March 8, 2024 · Fallout
If a loop contains an effect that says “[A] unless [B],” where [A] and [B] are each actions, no player can be forced to perform [B] to break the loop. If no player chooses to perform [B], the loop will continue as though [A] were mandatory.