Its a strong addition for at least Cube and casual EDH, and at least Standard sideboard play
There are new dual lands, as well, and these ones seem pretty powerful, entering untapped and tapping for colored mana as long as they just entered or you have at least one basic land
Released on October 16, 2000, the Gym Challenge 1st Edition cards were available in 11-card booster packs that consisted of seven common cards, three uncommon cards, and one rare card
Mystic Sanctuary: great fetchable utility land, can set us up with an extra turn with Walk the Aeons or even infinite turns with Venser, Shaper Savant in conjunction with the afromentioned extra turn spell
2 Emet-Selch, Unsundered/Hades, Sorcerer Of Eld From FFXIV Fill Your Graveyard, Then Use It As Your Second Hand Though Emet-Selch won't completely eradicate the board like a Rejoining eradicates a world, he can be dangerous if allowed to go unchecked for long enough