Heres how it plays out: You are required to have The Gitrog Monster out, Dakmor Salvage in hand and more than 7 cards in hand total At the end of the turn, discard down to hand size, discarding Dakmor Salvage This gives you a draw card trigger from The Gitrog Monster Priority passes to opponents On resolution of the draw trigger, replace this with the dredge from Dakmor Salvage, milling 2 cards and returning Dakmor Salvage to hand As it is still the cleanup step you still need to discard down to 7 cards in hand, again discarding Dakmor Salvage and repeating the combo above on a loop The idea is you loop this to fill your graveyard and try to win from there
Time of Need can help you find any legendary creature in your deck for just two mana, and considering the wide range of targets available, its easy to build your deck with the right toolbox of creatures
Some great examples that check all these boxes are Ledger Shredder, Fable of the Mirror-Breaker, and Davriel, Soul Broker
This tiered spell can instantly enter some white lifegain decks
There are also 12 Enchanted cards, which are the same as the cards they share their name with from the set, but feature exclusive artwork