Equipped creature gets +1/+0 and has "Whenever this creature attacks, you may sacrifice Spare Dagger. When you do, this creature deals 1 damage to any target." Equip {1}
Spare Supplies enters the battlefield tapped. When Spare Supplies enters the battlefield, draw a card. {2}, {T}, Sacrifice Spare Supplies: Draw a card.
"It's better to carry a little extra weight than to find yourself halfway down a baloth's throat with no knife." —Doral, Bala Ged guide
As an additional cost to cast this spell, discard a card. Protection from planeswalkers {1}: Sparkhunter Masticore deals 1 damage to target planeswalker. {3}: Sparkhunter Masticore gains indestructible until end of turn.
Spectacle {1}{B}{B} Flying, trample At the beginning of your upkeep, Spawn of Mayhem deals 1 damage to each player. Then if you have 10 or less life, put a +1/+1 counter on Spawn of Mayhem.
Sacrifice a creature: Put a charge counter on Spawning Pit. {1}, Remove two charge counters from Spawning Pit: Create a 2/2 colorless Spawn artifact creature token.
Annihilator 1 {4}: Create two 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this creature: Add {C}." {20}: Cast any number of Eldrazi spells from among cards you own outside the game without paying their mana costs.
Flying When Specter of Mortality enters the battlefield, you may exile one or more creature cards from your graveyard. When you do, each other creature gets -X/-X until end of turn, where X is the number of cards exiled this way.
Target opponent reveals their hand. You may choose a nonland card from it. If you do, that player exiles that card. If a nonblack card is exiled this way, exile a card from your hand.
"Imagine having your skeleton extracted through your ear, one bone at a time." —Corliss the Wanderer
All Sliver creatures have "{2}: This creature gets +1/+1 until end of turn."
"Sure, I've seen agents of the Cabal here and there. Well, not here, and certainly not in any of the sliver labs. Oh dear, I've said too much." —Apprentice researcher
Magecraft — Whenever you cast or copy an instant or sorcery spell, put a book counter on Spell Satchel. {T}, Remove a book counter from Spell Satchel: Add {C}. {3}, {T}, Remove three book counters from Spell Satchel: Draw a card.
Magecraft — Whenever you cast or copy an instant or sorcery spell, put a book counter on Spell Satchel. {T}, Remove a book counter from Spell Satchel: Add {C}. {2}, {T}, Remove two book counters from Spell Satchel: Draw a card.
Imprint — When Spellbinder enters the battlefield, you may exile an instant card from your hand. Whenever equipped creature deals combat damage to a player, you may copy the exiled card. If you do, you may cast the copy without paying its mana cost. Equip {4}