Just like Path to Exile, it's actually card disadvantage, (you trade your card to exile/destroy one of theirs and they get a land - total cards - You lost 1, they lost 1, and gained one, for a net of 1 card their way)
Shadowborn Demon Shadowborn Demon is a pushed 5/6 flier for 5 mana that also kills a creature when it enters
A little fun tip for those playing with Fable of the Mirror-Breaker
If you're already in the Undercity dungeon, then cards that read venture into the dungeon will instead progress you to the next room in the Undercity as opposed to having you enter another dungeon
This Tarkir: Dragonstorm Sultai Arisen Commander Deck includes 1 Black-Green-Blue deck of 100 Magic cards (98 nonfoil cards and 2 Traditional Foil Borderless Legendary cards), a 2-card Collector Booster Sample Pack (contains 1 Traditional Foil or nonfoil alt-border card of rarity Rare or higher and 1 Traditional Foil Uncommon card), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 strategy insert, and 1 reference card
Magic Online might be ugly and buggy, but it does more or less do its job