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Also, it is limited to creatures only, which Timeless Witness isnt, allowing you to rebuy removal cards if required

Leftmost: Increase its Level by 4

However, Gren Maju Da Eiza is an Effect Monster and could only be drawn from the deck

Once summoned, you can pay an additional cost of 2000 lifepoints to add 1 "Teleport" normal or quick-play spell to your hand

Like past Secret Lairs featuring non-MTG properties - an imprint the publisher calls Universes Beyond - these cards are not tournament legal but could be used in the Commander format if your table is okay with you placing a horde of winged figurines on the battlefield