Cards like Aetherworks Marvel are a great payoff, letting you cheat out cards from the top of your library for six energy counters, while Gonti's Aether Heart can grow your count more and give you an extra turn
Ryzeal has a play through most hand traps, and has a lot of interruptions on hand as well due to how little space the actual archetype takes space in a Deck List
Their abilities are relevant at any time, with smaller spells giving you a free scry, and bigger spells either adding to your battlefield or doming opponents
To play substitute cards in a tournament they must have an official Magic card back, clearly indicate the name of the card youre substituting, and you need to own the actual card
It can be a cantrip, which draws you a card on top of some other small effect, or something as big as Ancestral Recall, which draws you multiple cards for 1 mana