First, the deck features spells with a variety of powerful ETB abilities
Collecting Adventures in the Forgotten Realms You've had a long adventure
Enchantment Uncommon Monztre null/null LEGAL Standard LEGAL Future LEGAL Historic LEGAL Timeless LEGAL Gladiator LEGAL Pioneer LEGAL Explorer LEGAL Modern LEGAL Legacy NOT LEGAL Pauper LEGAL Vintage NOT LEGAL Penny LEGAL Commander LEGAL Oathbreaker LEGAL Standardbrawl LEGAL Brawl LEGAL Alchemy NOT LEGAL Pauper Commander LEGAL Duel NOT LEGAL Oldschool NOT LEGAL Premodern NOT LEGAL Predh Creature tokens you control have ": Add one mana of any color." Whenever one or more creature cards leave your graveyard, create a 0/1 green Plant creature token, then put a +1/+1 counter on each Plant you control
With Amulet of Vigor in play and enough lands on the battlefield, casting Scapeshift to fetch two Lotus Fields, Simic Growth Chamber, Tolaria West, and Shifting Woodland unlocks a chain reaction: the bounce land returns Tolaria West, which transmutes for Summoner's Pact, which finds Aftermath Analyst
But at least so far, none of the Secret Lair drops can really be considered a bad deal from a financial perspective (and this is without considering the possibility of getting a valuable bonus card)