There are probably enough resources on Youtube that can at least get you started on trying out a few things to see what works for you if youd like
You choose an artifact or creature card from it
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
The first order of the day, or the continuation of the last day's orders
Ashen Reaper's ability triggers at the beginning of each of your end steps, even if nothing has entered any graveyard that turn
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