It can also be cast at instant-speed if you draw it on your opponents turn, else you will likely only cast it for its Miracle cost during your upkeep
If you have a Sages Row Denizen on board, your opponents will instantly lose their entire libraries
That said, the three undercover creature win conditions within this deck are Bane of Bala Ged, Falkenrath Marauders, and Ulamogs Crusher
Sliver decks are based around each card granting incremental bonuses or individual keywords until you have an army of creatures with haste, +1/+1, vigilance, poisonous, trample, reach, and more
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Kaboom