Just remember that whichever mode you choose to cast becomes the mana value of the card on the stack and on the battlefield, unlike other, similar built-in cost reduction mechanics like Suspend or Miracle, s o a commander like Yuriko, the Tigers Shadow very much likes Prototype cards, while Vial Smasher the Fierce does not
Red So we have Knowledge Pool, and we have Thousand-Year Storm, and well, Im sure they had a great time together, because now we have Arcane Bombardment
There are 163 extended-art cards featuring legendary creatures from the main set and Commander decks
Ultimately, I'm not super impressed by the Red cards in the set yet, because a lot of them seem to rely on equipment
If the card has any mandatory additional costs, you must pay those if you want to cast the card