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X SPELL Continuous Once per turn, when the battle position of a Rock monster you control is changed: You can target 1 Spell/Trap your opponent controls

The short answer is typically 18, but its a bit more nuanced than that

Sometimes, the board state will resemble its old self when all is said and done, and other times something like a second board wipe can put a player earlier in the turn order far behind

Modern is the MTG format chosen for the Secret Lair Showdown

2021-04-16 For example, if you control Archmage Emeritus and cast an instant or sorcery spell, Archmage Emerituss magecraft ability will trigger and you will draw a card