set symbols) but I think I can answer your question
The placement of a comma or semicolon in a card's text can greatly change its functionality, as it determines whether the action is part of the card's cost to play it or its effect
The key though is to assess which cards cross this threshold, as merely good rares arent worth twisting your mana base for
Additionally, as much was as I would love for Hedron Crab to finally be viable in Commander, I dont believe the persistent milling trigger off of landfall would do a mill deck any good when two toughness means the crab is a casualty of something as simple as Pyroclasm
The point I want to get across though is how amazing the golden cards look
During either player's turn, when a Spell/Trap Card or another monster's effect is activated: You can shuffle 1 face-up Pendulum Monster from your Extra Deck into the Deck, negate the activation, and if you do, destroy that card