You can most easily identify Alt 4th cards by looking at the back
Enchantment Color tag templates(None) Leyline of Vitality If this card is in your opening hand, you may begin the game with it on the battlefield
Also, note it's power in any deck, but in tempo, aggro with Anthem effects, artifact and dorks matter like Losheen, Hate Bears, Auras, Equipment, Voltron, +1/+1 counters matter and more this is a must kill on sight guy
(2021-09-24) If a card with flashback is put into your graveyard during your turn, you can cast it if it's legal to do so before any other player can take any actions
Kinnan, Bonder Prodigy does the latter better than pretty much any commander in the format
You might have to order through a website and ship something out, or actually drive somewhere, but it should at least be a straightforward process