You can't cast noncreature spells.
Creature spells you cast cost {X} less to cast, where X is the greatest power among creatures you control.

Reach
Bumbling Bigfoot doesn't untap during your untap step.
Wander {1}{G}{G}

Amity — Whenever you attack with Bumbling Pollinator and exactly one other creature, create a 1/1 green Plant creature token.

Flying
Whenever you sacrifice a Memory, draw a card.

At the beginning of your end step, if a creature card or creature token was put into your graveyard from anywhere this turn, surveil 1.

Vigilance
Whenever Bureau Mentor attacks, teach target attacking creature with lesser power vigilance. Untap that creature.

Level up {3}
[level 2-5] Vigilance
[level 6+] Vigilance, indestructible

Buried Colossus enters tapped.
{T}: Add {G} or {W}.
{8}{G/W}: Buried Colossus becomes a 8/8 green and white Cyclops creature until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to green and white. Activate only once each turn.

Surface {3}{G}{G}
Buried Geode surfaces with a +1/+1 counter.

All spells cost {1} more to cast.
Spellcharge 6

Choose one —
• Destroy target noncreature artifact with mana value X.
• Burn Up deals X damage to target creature or planeswalker.

Amity — Whenever you attack with Burning Celestial and exactly one other creature, Burning Celestial acclimates.
As long as you control a red Weather, Burning Celestial has trample.

This spell costs {1} less to cast for each creature and/or enchantment card in your graveyard.
Ward—Discard a card.

Vigilance
Fabric — This creature gets +1/+1 for each enchantment you control.

Bustling Motorway enters tapped.
{T}: Add {U} or {R}.
{4}: Make a pledge. Activate only as a sorcery.

Whenever a source you control deals noncombat damage to an opponent, you draw a card and you lose 1 life. This ability triggers only once each turn.
At the beginning of your end step, if you sacrificed three or more permanents this turn, this enchantment deals 3 damage to any target.

Flash
Flying
Islandcycling {2}

Whenever this Subroutine runs, discard up to three cards, then draw that many cards.

Whenever this Subroutine runs, creatures you control get +2/+0 until end of turn. Target creature you control gains first strike until end of turn.

Whenever this Subroutine runs, create a token that's a copy of target creature you control.

Approval — When Cabinet Recruiter enters, you may search your library for a creature card with mana value less than or equal to the number of colors among permanents you control, reveal it, put it into your hand, then shuffle.

Haste
As long as it's your turn, this creature has first strike.
At the beginning of combat on your turn, sacrifice a Memory.
Whenever this creature attacks, cache the top card of your library face down.

When Cairnblade of the Ancients enters, destroy target creature an opponent controls.
Equipped creature gets +4/+2 and has vigilance.
Equip {4}

Calamitous War Cry deals 2 damage to each creature. If there are six or more different creature types among creatures you control as you cast this spell, it deals 2 damage to each creature you don't control instead.

Haste
{T}, Discard a card: Put a +1/+1 counter on another target creature you control and untap it. It gains haste until end of turn. Activate only as a sorcery.