Whenever Archon of the Triumvirate attacks, detain up to two target nonland permanents your opponents control. (Until your next turn, those permanents can't attack or block and their activated abilities can't be activated.)
4 /
5
{2}
Armillary Sphere
Artifact
{2}, {T}, Sacrifice Armillary Sphere: Search your library for up to two basic land cards, reveal them, put them into your hand, then shuffle.
{3}{W}{U}
Armored Guardian
Creature - Cat Soldier
{1}{W}{W}: Target creature you control gains protection from the color of your choice until end of turn.
{1}{U}{U}: Armored Guardian gains shroud until end of turn. (It can't be the target of spells or abilities.)
2 /
5
{3}{U}{U}{U}
Atemsis, All-Seeing
Legendary Creature - Sphinx
Flying
{2}{U}, {T}: Draw two cards, then discard a card.
Whenever Atemsis, All-Seeing deals damage to an opponent, you may reveal your hand. If cards with at least six different mana values are revealed this way, that player loses the game.
4 /
5
{1}{U}
Augur of Bolas
Creature - Merfolk Wizard
When Augur of Bolas enters the battlefield, look at the top three cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
1 /
3
{W}{U}
Battlewise Hoplite
Creature - Human Soldier
Heroic -- Whenever you cast a spell that targets Battlewise Hoplite, put a +1/+1 counter on Battlewise Hoplite, then scry 1. (To scry 1, look at the top card of your library, then you may put that card on the bottom of your library.)
2 /
2
{3}{W}
Benalish Heralds
Creature - Human Soldier
{3}{U}, {T}: Draw a card.
2 /
4
{1}
Braidwood Sextant
Artifact
{2}, {T}, Sacrifice Braidwood Sextant: Search your library for a basic land card, reveal that card, put it into your hand, then shuffle.
{2}{U}
Command of Unsummoning
Instant
Cast this spell only during the declare attackers step and only if you've been attacked this step.
Return one or two target attacking creatures to their owner's hand.
{1}{U}
Consuming Vortex
Instant - Arcane
Return target creature to its owner's hand.
Splice onto Arcane {3}{U} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)
{1}{U}{U}{U}
Cryptic Command
Instant
Choose two --
• Counter target spell.
• Return target permanent to its owner's hand.
• Tap all creatures your opponents control.
• Draw a card.
{1}{U}
Dampen Thought
Instant - Arcane
Target player mills four cards.
Splice onto Arcane {1}{U} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)
{1}{W}
Dauntless River Marshal
Creature - Human Soldier
Dauntless River Marshal gets +1/+1 as long as you control an Island.
{3}{U}: Tap target creature.
2 /
1
{1}{W}{U}
Daxos of Meletis
Legendary Creature - Human Soldier
Daxos of Meletis can't be blocked by creatures with power 3 or greater.
Whenever Daxos of Meletis deals combat damage to a player, exile the top card of that player's library. You gain life equal to that card's mana value. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell.
2 /
2
{1}{W}{U}
Drogskol Captain
Creature - Spirit Soldier
Flying
Other Spirit creatures you control get +1/+1 and have hexproof. (They can't be the targets of spells or abilities your opponents control.)
2 /
2
{W}
Elite Arrester
Creature - Human Soldier
{1}{U}, {T}: Tap target creature.
0 /
3
{X}{U}
Epiphany at the Drownyard
Instant
Reveal the top X plus one cards of your library and separate them into two piles. An opponent chooses one of those piles. Put that pile into your hand and the other into your graveyard.
{2}{U}
Erratic Mutation
Instant
Choose target creature. Reveal cards from the top of your library until you reveal a nonland card. That creature gets +X/-X until end of turn, where X is that card's mana value. Put all cards revealed this way on the bottom of your library in any order.
{1}{U}
Everdream
Instant
Draw a card.
Splice onto instant or sorcery {2}{U} (As you cast an instant or sorcery spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)
--
Evermind
Instant - Arcane
(Nonexistent mana costs can't be paid.)
Draw a card.
Splice onto Arcane {1}{U} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)
{3}{U}
Fact or Fiction
Instant
Reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard.
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
{3}{W}{U}
Lavinia of the Tenth
Legendary Creature - Human Soldier
Protection from red
When Lavinia of the Tenth enters the battlefield, detain each nonland permanent your opponents control with mana value 4 or less. (Until your next turn, those permanents can't attack or block and their activated abilities can't be activated.)
4 /
4
{W}{U}
Lavinia, Azorius Renegade
Legendary Creature - Human Soldier
Each opponent can't cast noncreature spells with mana value greater than the number of lands that player controls.
Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.
2 /
2
{2}{U}
Leadership Vacuum
Instant
Target player returns each commander they control from the battlefield to the command zone.
Draw a card.
{1}{W}{U}
Lyev Skyknight
Creature - Human Knight
Flying
When Lyev Skyknight enters the battlefield, detain target nonland permanent an opponent controls. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)
3 /
1
{3}{U}{U}
Mystic Confluence
Instant
Choose three. You may choose the same mode more than once.
• Counter target spell unless its controller pays {3}.
• Return target creature to its owner's hand.
• Draw a card.
--
Mystic Sanctuary
Land - Island
({T}: Add {U}.)
Mystic Sanctuary enters the battlefield tapped unless you control three or more other Islands.
When Mystic Sanctuary enters the battlefield untapped, you may put target instant or sorcery card from your graveyard on top of your library.
{W}{U}
New Prahv Guildmage
Creature - Human Wizard
{W}{U}: Target creature gains flying until end of turn.
{3}{W}{U}: Detain target nonland permanent an opponent controls. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)
2 /
2
{2}{U}
Parapet Watchers
Creature - Kithkin Soldier
{W/U}: Parapet Watchers gets +0/+1 until end of turn.
2 /
2
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
--
Plains
Basic Land - Plains
({T}: Add {W}.)
{3}{W/U}
Repel Intruders
Instant
Create two 1/1 white Kithkin Soldier creature tokens if {W} was spent to cast this spell. Counter up to one target creature spell if {U} was spent to cast this spell. (Do both if {W}{U} was spent.)
{2}{W}{U}
Spire Patrol
Creature - Human Soldier
Flying
When Spire Patrol enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
3 /
2
{2}{W/U}
Thistledown Duo
Creature - Kithkin Soldier Wizard
Whenever you cast a white spell, Thistledown Duo gets +1/+1 until end of turn.
Whenever you cast a blue spell, Thistledown Duo gains flying until end of turn.