Check out Dicebreakers coverage of the first details for the fairy tale set
Creatures (31) 3 Goblin Vandal 4 Goblin Recruiter 4 Goblin Matron 4 Goblin Lackey 2 Kiki-Jiki, Mirror Breaker 3 Goblin Warchief 1 Goblin Sharpshooter 4 Goblin Piledriver 1 Gempalm Incinerator 1 Siege-Gang Commander 3 Goblin Ringleader 1 Skirk Prospector Lands (18) Spells (11) Sideboard Once you stack your deck, every Ringleader will hit four more Goblins, meaning you can basically just draw whatever sixteen Goblins you want (and thats not even factoring in Goblin Matron)
But despite the value of the cards, they all need protection with various means
Other Secret Lairs have been purchasable in the Magic Online store, and theres always the possibility that specific cards get added to Treasure Chests, though thats unlikely for Universes Beyond cards that arent mechanically unique
This refunds you 1 mana for the dragon, 2 if it lives through combat
This adept combatant seizes control of Fire Warrior units, either summoning them to hand or sending them to the graveyard