When River Herald Scout enters the battlefield, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Flying

: You gain 2 life and draw a card.

Whenever River Kelpie or another permanent enters the battlefield from a graveyard, draw a card.

Whenever a player casts a spell from a graveyard, draw a card.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

: Add . If you played a land this turn, add instead.

River Sneak can't be blocked.

Whenever another Merfolk enters the battlefield under your control, River Sneak gets +1/+1 until end of turn.

Imprint — Whenever a player casts an instant or sorcery spell from their hand, exile it instead of putting it into a graveyard as it resolves.

At the beginning of your upkeep, if there are four or more cards exiled with River Song's Diary, choose one of them at random. You may cast it without paying its mana cost.

: Add .

If was spent to cast this spell, return up to one target creature to its owner's hand. If was spent to cast this spell, target player reveals their hand, you choose a nonland card from it, then that player discards that card. (Do both if was spent.)

Flying

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever you sacrifice a creature, you may return target creature card with lesser mana value from your graveyard to the battlefield tapped. Do this only once each turn.

Choose three. You may choose the same mode more than once.

• You draw a card and you lose 1 life.

• Riveteers Confluence deals 1 damage to each creature and planeswalker you don't control.

• You may put a land card from your hand or graveyard onto the battlefield tapped.

: Riveteers Initiate gains deathtouch until end of turn.

Menace

When Riveteers Provocateur enters the battlefield, choose a creature card in your hand without blitz. It perpetually gains blitz. The blitz cost is equal to its mana cost.

Blitz (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)

When Riveting Rigger enters the battlefield, you may sacrifice another artifact. If you do, put two +1/+1 counters on Riveting Rigger and it assembles a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)

This spell can't be countered.

Sliver spells can't be countered.

Kicker—Sacrifice a land. (You may sacrifice a land in addition to any other costs as you cast this spell.)

Return target nonland permanent to its owner's hand. If this spell was kicked, return another target nonland permanent to its owner's hand.

Improvise (Each artifact you tap after you're done activating mana abilities pays for .)

Reveal the top X cards of your library. You may put any number of artifact cards with mana value X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield into your graveyard.

+1: Dragon cards in your hand perpetually gain "This spell costs less to cast", and "You may pay rather than pay this spell's mana cost, where X is its mana value."

0: Conjure a card named Shivan Dragon into your hand.

−2: Sarkhan, Wanderer to Shiv deals 3 damage to target creature.

Kicker (You may pay an additional as you cast this spell.)

Creatures you control gain first strike until end of turn. If this spell was kicked, they get +1/+1 until end of turn.

Target creature gets +4/+0 until end of turn. Another target creature gets -4/-0 until end of turn.

Scrapdiver Serpent can't be blocked as long as defending player controls an artifact.

When Scrivener enters the battlefield, you may return target instant card from your graveyard to your hand.

Reorder your graveyard at random. An opponent chooses a card at random in your graveyard. If it's a creature card, put it onto the battlefield. Otherwise, exile it.

Target creature gets +1/+1 and gains first strike until end of turn.

Search your library for any number of nonland cards, exile them, then shuffle.

: Look at the top three cards of your library, then put them back in any order.

: Draw a card, then put Sensei's Divining Top on top of its owner's library.

Sliver creatures you control have vigilance. (Attacking doesn't cause them to tap.)

All Sliver creatures have shadow. (They can block or be blocked by only creatures with shadow.)

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Flying, haste

Flying (This creature can't be blocked except by creatures with flying or reach.)

: Shivan Dragon gets +1/+0 until end of turn.

Kicker (You may pay an additional as you cast this spell.)

Shivan Fire deals 2 damage to target creature. If this spell was kicked, it deals 4 damage instead.

, Sacrifice a creature: Destroy target nonbasic land.

Shivan Meteor deals 13 damage to target creature.

Suspend 2— (Rather than cast this card from your hand, you may pay and exile it with two time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

Flying

When Shivan Phoenix dies, return Shivan Phoenix to its owner's hand.

: Add .

: Add or . Shivan Reef deals 1 damage to you.

Trample

When Shivan Wumpus enters the battlefield, any player may sacrifice a land. If a player does, put Shivan Wumpus on top of its owner's library.

Protection from white

Flying

: Shriekdiver gains haste until end of turn.

Choose one —

• Until end of turn, whenever a creature is dealt damage, destroy it.

• Until end of turn, whenever a creature dies, that creature's controller loses life equal to its toughness.

Entwine (Choose both if you pay the entwine cost.)

All Sliver creatures have flanking. (Whenever a creature without flanking blocks a Sliver, the blocking creature gets -1/-1 until end of turn.)

Flash

When Singer of Swift Rivers enters the battlefield, put a shield counter on another target creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

You may cast Merfolk spells as though they had flash.

+1: Until your next turn, creatures can't attack you or planeswalkers you control unless their controller pays 2 life for each of those creatures.

−3: Search your library for a Dragon card, reveal it, put it into your hand, then shuffle.

−7: Destroy all non-Dragon creatures.

Sivitri, Dragon Master can be your commander.

If an opponent controls a Mountain and you control a Plains, you may cast this spell without paying its mana cost.

Prevent all damage that would be dealt this turn to creatures you control.

At the beginning of your upkeep, you lose 1 life and create a 1/1 colorless Phyrexian Mite artifact creature token with toxic 1 and "This creature can't block."

Corrupted — As long as an opponent has three or more poison counters, creatures you control with toxic have lifelink.

Eldrazi you control are Slivers in addition to their other types.

Slivers you control have devoid and have annihilator 1.

: Create a 1/1 colorless Eldrazi Sliver creature token. It has "Sacrifice this creature: Add ."

The "legend rule" doesn't apply to Slivers you control.

Each Sliver creature card in your graveyard has encore , where X is its mana value.

Encore (, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

Sliver creatures you control have indestructible. (Damage and effects that say "destroy" don't destroy them.)

: Search your library for a Sliver card, reveal that card, put it into your hand, then shuffle.

: Gain control of target Sliver. (This effect lasts indefinitely.)

, , Discard a card: Create a 1/1 colorless Sliver artifact creature token named Metallic Sliver.

: Add one mana of any color.

, : Untap another target artifact.

, : Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

, : Target creature can't be blocked this turn.