For all its convoluted text, it basically turns counters into mana you can use to cast artifacts, and the conversion rigamarole lets it keep building up counters as Jetfire, Air Guardian
This card is good because it has a buy back of 3 generic meaning you pay the additional 3 generic mana and then put Capsize back into your hand to cast later If you have infinite blue mana, you can return all permanents, including lands, to your opponents hands Brazen Borrower // Petty Theft The adventure is an instant that returns nonland permanent opponent owns to their hand Then you have a 3/1 flyer you cast at instant speed due to it having flash Aether Channeler A creature that when it enters the battlefield, you can choose one: Create a 1/1 bird token Return any other nonland permanent to its owners hand Draw a card This is an excellent flicker/blink target Into the Roil / Blink of an Eye These both are the exact same cards with different names
Modern Horizons 2 released on June 18, 2021, and introduced Set Boosters as a distinct product from Draft Boosters
It rocks card-draw, discard, and more
What happens if you give an answer and then something happens that keeps you from doing what you said
Not to worry - apparently other people play Instants and Sorceries in their decks so they can draw cards and not have to worry about the heart of the cards