Rushing Waters enters the battlefield tapped. {T}: Add {U} or {R}. When Rushing Waters enters the battlefield, you may put a loyalty counter on a planeswalker you control.
Rustshell Crustacean gets +1/+1 for each artifact you control. Whenever Rustshell Crustacean attacks, choose one — • Search your library for an Equipment card, reveal it, and put it into your hand, then shuffle. • Create a Treasure token.
Whenever S-40 Wallbreaker attacks, create a 1/1 colorless Construct artifact creature token. {X}, Sacrifice X artifacts: S-40 Wallbreaker deals X damage to each opponent.
Equipped creature gets +2/+0 and can't be blocked. Whenever a Rogue you control attacks, you may pay {1}. If you do, attach Saber of Defiled Rites to it. Equip {5}
({T}: Add {W}.) Sacred Sanctuary enters the battlefield tapped with two sanctum counters on it. {T}, Remove a sanctum counter from Sacred Sanctuary: Add {G} or {U}.
Sacred Summits enters the battlefield tapped. {T}: Add one mana of any color among the color identity of legendary creatures and planeswalkers you control or legendary cards in your command zone.
Sage's Ashes enters the battlefield tapped. {T}, Sacrifice Sage's Ashes: Put target card from a graveyard on top of its owner's library. {3}, Exile Sage's Ashes from your graveyard: Draw a card.
Haste Sandstorm Sentinel enters the battlefield with X +1/+1 counters on it, where X is your fealty to Deserts. (Each Desert you control counts toward your fealty to Deserts.) Mirage {1}{R}(You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)
({T}: Add {G}.) Savage Sanctuary enters the battlefield tapped with two sanctum counters on it. {T}, Remove a sanctum counter from Savage Sanctuary: Add {R} or {W}.
Creature spells you cast cost {2} less to cast. Whenever a creature enters the battlefield under your control, if it doesn't have vanishing, put four time counters on it and it gains vanishing. (At the beginning of your upkeep, remove a time counter from that permanent. When the last is removed, sacrifice it.)