Counter target spell unless its controller pays {2}. Look at its controller's hand and the top card of their library.

Counter target spell. Untap up to four lands.

Draw a card. If you've amped it up this turn, creatures your opponents control get -1/-0 until end of turn.

Whenever Smooth Operator deals combat damage to a player, draw a card.

At the beginning of your end step, if you control three or more untapped lands, up to one target nonland permanent doesn't untap during its controller's next untap step.

Flying
Drop — When Sphinx of the Soundveins enters, if you didn't cast any creature spells during your last turn, untap up to three lands.

Flying
Drop — When Staggering Wyvern enters, if you didn't cast any creature spells during your last turn, tap up to two target creatures. Those creatures don't untap during their controller's next untap step.

Flash
When Tempo Arbiter enters, up to one target creature gets -X/-0 until end of turn, where X is the number of artifacts you control.

Draw two cards.
Up to one target creature gains flying until end of turn.

Equipped creature gets +1/+0.
Whenever equipped creature attacks, you may cast an instant or sorcery card from your hand with mana value X or less without paying its mana cost, where X is equipped creature's power.
Equip {2}

At the beginning of your end step, if you control three or more untapped lands, you may exile another target permanent you control, then return it to the battlefield under its owner's control.
{1}{U}{U}: Scry 1.

{T}: Target land you control becomes the basic land type of your choice until end of turn.
{2}{U}, {T}: Draw a card, then discard a card. This ability costs {2} less to activate if you control four or more lands with different names.

When Ambient Illuminator dies, if you've scried this turn, you gain 3 life and draw a card.

Menace
Drop — Whenever Avatar of the Decks or another creature you control enters, if the entering creature was cast, sacrifice a permanent unless you didn't cast any creature spells during your last turn.

{4}{B}{B}, Exile Begin the Imperial Era from your hand: At the beginning of your next upkeep, you may cast Begin the Imperial Era from exile without paying its mana cost. Activate only as a sorcery.
You draw three cards and each opponent discards three cards. Each player loses 3 life.

Target creature you control gets +2/+0 and gains lifelink until end of turn. When that creature dies this turn, draw a card.

Whenever a creature dies, scry 1.

Flash
When Corrosive Spitter enters, destroy all creatures that were dealt damage this turn.

When Cutting Room Floor enters, scry 2.
Whenever you scry, you may pay {1}. If you do, target creature gets -X/-X until end of turn, where X is the number of cards you looked at.

All creatures get -2/-2 until end of turn. Scry 1.

Target creature gets -3/-2 until end of turn.

Choose one —
• Target player sacrifices a creature with the least power among creatures they control.
• Target player sacrifices a creature with the least toughness among creatures they control.

When Go Solo enters, sacrifice any number of creatures. Draw a card for each creature sacrificed this way.
As long as you control exactly one creature, that creature gets +2/+2 and has deathtouch and lifelink.

Target player reveals their hand. You choose a nonland card from it. Exile that card. Each player draws a card and loses 1 life.

Menace
Drop — Lurking Glitch enters with two +1/+1 counters on it if you didn't cast any creature spells during your last turn.