Dragon Broodmother [Alara Reborn] Serpent Set: Return to Ravnica Type:

Set: Return to Ravnica Type: Land — Swamp Forest Rarity: Rare ({T}: Add {B} or {G}

{W}: Enchanted creature gets +0/+1 until end of turn

The "Sheep Tokens" cannot be used as a Tribute for a Tribute Summon (or Set)

and their effects

The Battle of Tomakul taught Urza not to rely on fickle reinforcements

Dragon Broodmother [Alara Reborn] Serpent Set: Return to Ravnica Type:Set: Alara Reborn Type: Creature Dragon Rarity: Mythic Cost: {2}{R}{R}{R}{G} Flying At the beginning of each upkeep, create a 1 1 red and green Dragon creature token with flying and devour 2. (As the token enters the battlefield, you may sacrifice any number of creatures. It enters the battlefield with twice that many +1 +1 counters on it.)