First strike
When Photon Collector enters the battlefield, scry 2.

Whenever one or more cards leave your graveyard, put a +1/+1 counter on Phyto, Caverns Scourge, then each opponent loses life equal to half its power, rounded up. This ability triggers only once each turn.
{X}{X}{B}{G}, Exile Phyto, Caverns Scourge from your graveyard: Return X other target permanent cards from your graveyard to your hand.

Noncreature spells you cast cost {1} less to cast.

Vigilance
{W}, {T}: Tap target creature with power 2 or less.
Cybersoul {3}{W}

Other Advisors you control get +1/+1.
Whenever Prime Consuls attacks, defending player may pay {1}. If they do, put a +1/+1 counter on Prime Consuls. Otherwise, create a 2/2 white Advisor creature token that's tapped and attacking.

Flash
Whenever you cast a noncreature spell, Prismatic Pack gets +1/+1 until end of turn. Untap it.

When Prismatic Remnant enters the battlefield, scry 2.

{VP}{VP}{VP}: Pristine Star gains double strike until end of turn.

As Prodigious Hater enters the battlefield, look at an opponent's hand, then choose a nonland card name.
Whenever an opponent casts a spell with the chosen name, Prodigious Hater deals 3 damage to that player.

As an additional cost to cast spells during an opponent's turn, you may pay {U} and reveal Promethean Jaxl from your hand. If you do, you get a lurk counter.
Flash
Promethean Jaxl enters the battlefield tapped.
When Promethean Jaxl enters the battlefield, you draw a card for each lurk counter you have, then you lose all lurk counters.

Flash
Ward {4}
When Psychedelic Serpent enters the battlefield, gain control of target instant spell, sorcery spell, activated ability, or triggered ability. You may choose new targets for it.

Revolt — When Pureheart Cavalier enters the battlefield, if a permanent you controlled left the battlefield this turn, create a 1/1 red Soldier creature token.

When Pursuer of Divinity enters, you may search your library for a double-faced card, reveal it, put it into your hand, then shuffle.
Cybersoul {4}{W}{B}

Haste
{T}, Sacrifice Pyrote Entity: It deals 1 damage to any target.

Flying, deathtouch, haste

Menace
Whenever another creature you control with menace attacks, create a token that's a copy of that creature that's tapped and attacking. Exile that token at the beginning of the next end step.

Solidarity
{R}: Choose a creature type. Ragecloak Shifter gets +1/+0 and becomes that type in addition to its other types until end of turn.

Menace
Creatures you control get +1/+0 if you've cast a spell that targeted Rathomar Forerunner this turn.

When Reaching Remnant enters the battlefield, it deals 4 damage to target creature with flying you don't control.
Spellcharge 3

Whenever Reaper of Fields attacks, bless target land.

Flying
Equipped creature gets +2/+0.
Equip {2}
Spellcharge 2

Relentless Busker can't block.
{VP}{VP}{VP}: Return Relentless Busker from your graveyard to the battlefield.

Lifelink
Relentless Whisper can't block.
Escape—{4}{B}, Exile four other cards from your graveyard.
Relentless Whisper escapes with a +1/+1 counter on it.

Flying
Whenever another Spirit enters the battlefield under your control, put a +1/+1 counter on Reliquary Haunt.

Other creatures you control get +1/+1 and have vigilance.
Spellcharge 5