Obsidian Armor

[Pigmy wurm]

Obsidian Armor
Enchantment-aura
As an additional cost to cast ~ sacrifice a mountain.
Enchant creature
Enchanted creature gets +3/+1.
When ~ is put into a graveyard from the battlefield, return it to its owner's hand.

[guyarney]

Obsidian Armor
Enchantment-aura
As an additional cost to cast ~ sacrifice a mountain.
Enchant creature
Enchanted creature gets +3/+1.
When ~ is put into a graveyard from the battlefield, return it to its owner's hand.

Very nice concept. This could be a block's obligatory red-grants-haste card ala Burst of Speed , Chaos Charm , Crimson Wisps , Fever Charm , Mark of Fury (notably), Reckless Charge (notably), Surge of Zeal , and Unnatural Speed , only if designed as follows it would at least be attempting to be on par with the M13 reprint Rancor if:

Obsidian Armor (Uncommon)

Enchantment - Aura
Enchant creature
Enchanted creature gets +2/+0 and haste.
When Obsidian Armor is put into a graveyard from the battlefield, return Obsidian Armor to its owner's hand.