Avalanche Riders [Urza's Legacy] Legendary Artifact Set: Champions of Kamigawa Type:

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

Niv-Mizzet

Set: Battle for Zendikar Type: Enchantment Rarity: Mythic Cost: {X}{X}{W}{W} Quarantine Field enters the battlefield with X isolation counters on it

if Hidden Stag is a creature

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

Avalanche Riders [Urza's Legacy] Legendary Artifact Set: Champions of Kamigawa Type:Set: 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.