Boros Signet

Reliquary Tower

You have no maximum hand size.
{T}: Add {C}.

Island

Puca's Mischief

At the beginning of your upkeep, you may exchange control of target nonland permanent you control and target nonland permanent an opponent controls with equal or lesser mana value.

Commander's Sphere

{T}: Add one mana of any color in your commander's color identity.
Sacrifice this artifact: Draw a card.

Perplexing Chimera

Whenever an opponent casts a spell, you may exchange control of this creature and that spell. If you do, you may choose new targets for the spell. (If the spell becomes a permanent, you control that permanent.)

Ruby Leech

First strike
Red spells you cast cost {R} more to cast.

Sapphire Leech

Flying
Blue spells you cast cost {U} more to cast.

Thought Devourer

Flying
Your maximum hand size is reduced by four.

Steel Golem

Alabaster Leech

White spells you cast cost {W} more to cast.

Bazaar Trader

{T}: Target player gains control of target artifact, creature, or land you control.

Grid Monitor

Rust Elemental

Flying
At the beginning of your upkeep, sacrifice another artifact. If you can't, tap this creature and you lose 4 life.

Sol Ring

Izzet Signet

Troublesome Spirit

Flying
At the beginning of your end step, tap all lands you control.

Swiftfoot Boots

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control. It can attack and {T} no matter when it came under your control.)
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Nine Lives

Hexproof
If a source would deal damage to you, prevent that damage and put an incarnation counter on this enchantment.
When there are nine or more incarnation counters on this enchantment, exile it.
When this enchantment leaves the battlefield, you lose the game.

Mountain

Ghostly Prison

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Thought Eater

Flying
Your maximum hand size is reduced by three.

Counterspell

Zedruu the Greathearted

At the beginning of your upkeep, you gain X life and draw X cards, where X is the number of permanents you own that your opponents control.
{U}{R}{W}: Target opponent gains control of target permanent you control.

Thought Nibbler

Flying
Your maximum hand size is reduced by two.

Azorius Signet

Chaos Warp

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Sudden Substitution

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Exchange control of target noncreature spell and target creature. Then the spell's controller may choose new targets for it.

Cephalid Vandal

At the beginning of your upkeep, put a shred counter on this creature. Then mill a card for each shred counter on this creature.

Aggressive Mining

You can't play lands.
Sacrifice a land: Draw two cards. Activate only once each turn.