Its such a useful card, with a variety of options and modes for you to harness its power at the table
On its reverse, it features the card back used for Magic: The Gathering cards - the result of having been printed on Magic: The Gathering card stock as a test run
The only cards from the list above that had their characters reprinted in other sets are Baron Sengir and Eron, which were last seen in MTG sets Commander Legends (2020) and Time Spiral (2006), respectively
It is like super proactive Mother of Runes
Flying You can tap any four untapped artifacts, creatures, and/or lands you control, including creatures you haven't controlled continuously since the beginning of your most recent turn, to pay the additional cost to cast Guardian of the Great Door
It has similar advantages to cards like Yawgmoth's Will or Past in Flames when youre going off in a storm combo, and you can also mill yourself and win with Thassa's Oracle