Avalanche Riders [Urza's Legacy] Legendary Artifact if Hidden Stag is a

if Hidden Stag is a creature

Set: Champions of Kamigawa Type: Sorcery Rarity: Uncommon Cost: {1}{R} Sacrifice any number of lands

While Lazav schemed and Niv-Mizzet researched

Set: Born of the Gods Type: Creature — Centaur Warrior Rarity: Uncommon Cost: {1}{R}{G} Trample

"It has been my honor to improve on the Thran's original design

Avalanche Riders [Urza's Legacy] Legendary Artifact if Hidden Stag is aSet: Urza's Legacy Type: Creature Human Nomad Rarity: Uncommon Cost: {3}{R} Haste Echo {3}{R} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When Avalanche Riders enters the battlefield, destroy target land.