Also, since the Burning Abyss monsters have their effects activate in the GY, youll have the advantage with cards whose effects activate in the GY when you send monsters you control from the field and hand to the GY
It is a bit unusual in that its evolved form, Urshifu, has appeared on a total of 8 different cards
Unfortunately, too many will have Oath of Nissa anyway, to say nothing of just playing a third red source
Urza, Planeswalker Meld Meld is overpowered, but the Meld requirement makes enough sense of both design and flavor
You get to tap your rocks for mana, bounce them back to hand, and then recast them to increase your storm count and hopefully even net extra mana, although that requires more artifacts that produce more mana than they cost like Sol Ring, Mana Vault, and Grim Monolith
You can find the full list of legendary creatures, and this also includes the all-powerful monkey Ragavan, over at the Multiverse Legends card gallery