As Barren Desolation enters, you may pay 2 life. If you don't, Barren Desolation enters tapped. {T}, Sacrifice Barren Desolation: Search your library for a Plains or Swamp card, put it onto the battlefield, then shuffle.
({T}: Add {W}.) Bygone Guardian enters tapped. Vigilance {2}{W}{W}: Bygone Guardian becomes a creature in addition to its other types until end of turn.
Cradle of Corruption enters tapped. Whenever a creature dies, put a creation counter on Cradle of Corruption. {T}, Remove ten creation counters from Cradle of Corruption and sacrifice it: Put up to two target creature cards from graveyards onto the battlefield under your control. Activate only as a sorcery.
{T}: Add {C}. {1}, {T}: Target player exiles a card from their graveyard. If a creature or planeswalker card is exiled this way, create a Vessel token. (It's an enchantment with “{2}, Sacrifice this enchantment: Create a 1/1 white Spirit creature token with flying.”)
Elrayin, the Manaroot enters tapped. Whenever you tap another land for mana, put a creation counter on Elrayin. {T}, Remove ten creation counters from Elrayin and sacrifice it: Untap all lands target player controls.
As Floodwater Depths enters, you may pay 2 life. If you don't, Floodwater Depths enters tapped. {T}, Sacrifice Floodwater Depths: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.
{T}, Pay 1 life: Add {U}. {T}, Pay 1 life, Sacrifice Gleaming River: Search your library for an Island card, put it onto the battlefield tapped, then shuffle.
As Grim Bastion enters, you may pay 2 life. If you don't, Grim Bastion enters tapped. {T}, Sacrifice Grim Bastion: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.
The Last Sacred Gate enters tapped. While you're searching your library, you may play The Last Sacred Gate from your library. (You may only do so during your turn and if you have a land play remaining.) {T}: Add {C}.