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This is a wide, cover-all term referring to functional cards which allow players to pull off specific moves or abilities

You can only use each of the following effects of "Beetrooper Cruel Saturnas" once per turn

Audy takes it from here

Thirty-five minutes later, in the midst of a game with no one dying and with a fairly good state of equilibrium, someone dropped Grim Monolith followed by Power Artifact (which together make infinite colorless mana) and his commander Oona to win the game right then and there

and Liliana, Dreadhorde General

D.'s 1st effect sends a Blue-Eyes White Dragon from your hand or deck to the GY to special summon itself