Urborg Justice [Weatherlight] Elder Dragon if you control at least

if you control at least five other Mountains

Exile them at the beginning of the next end step

Set: Commander 2016 Type: Artifact Creature — Construct Rarity: Rare Cost: {4} Converge — Crystalline Crawler enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it

Set: Onslaught Type: Sorcery Rarity: Rare Cost: {6}{G}{G} Each player's life total becomes the number of creatures they control

(For example

Urborg Justice [Weatherlight] Elder Dragon if you control at leastSet: Weatherlight Type: Instant Rarity: Rare Cost: {B}{B} Target opponent sacrifices a creature for each creature put into your graveyard from the battlefield this turn. "It is a narrow line between justice and vengeance." Crovax