Seek a nonland artifact card with mana value X or less and put it onto the battlefield. If a card with mana value less than X is put onto the battlefield this way, this spell perpetually gains "This spell costs more to cast," then return this spell to its owner's hand.

When Propagator Primordium enters, conjure two cards named Propagator Primordium into your graveyard.
At the beginning of your upkeep, put a spore counter on Propagator Primordium.
Remove three spore counters from Propagator Primordium: Return target Fungus creature card from your graveyard to the battlefield.

At the beginning of your end step, you may exile another artifact you control or an artifact card in your graveyard. If you do, seek an artifact card. That card perpetually has base power and toughness 1/1 and becomes a Gnome creature in addition to its other types.

Menace
: Kamachal, Ship's Mascot gets +1/+0 until end of turn.
Whenever Kamachal deals combat damage to a player, create a Treasure token. Then exile from that player's library a random card with mana value equal to the damage dealt. You may cast that card this turn.

Whenever Legion Reconsecrator attacks, exile up to one target creature card from a graveyard. If you do, conjure a duplicate of it into your graveyard. The duplicate perpetually becomes a black Skeleton with base power and toughness 3/1 in addition to its other colors and types.
When Legion Reconsecrator dies, return another target creature card with power or toughness 1 from your graveyard to the battlefield.

When High Marshal Arguel dies, conjure a card named Arguel's Blood Fast onto the battlefield and you may transform it. If you control an enchantment named Arguel's Blood Fast and a land named Temple of Aclazotz, instead create two 4/3 white and black Vampire Demon creature tokens with flying.

Starting intensity 3
Return any number of creature cards with total mana value X or less from your graveyard to the battlefield, where X is Legion's Chant's intensity.
All Chorus cards you own intensify by 1.

Enrage — Whenever Stalwart Speartail is dealt damage, other Dinosaurs you control and Dinosaur cards in your hand and library perpetually get +1/+1.
Whenever Stalwart Speartail attacks, Stalwart Speartail deals 1 damage to each creature and each planeswalker.

Flying
Whenever Valiant Batrider deals combat damage to a player, that player gets a one-time boon with "When you cast a noncreature spell, you may pay . If you don't, each opponent draws a card."

When Scalespeaker Shepherd enters, draft a card from Scalespeaker Shepherd's spellbook.
Dinosaur spells you cast cost less to cast.

Starting intensity 2
Each player sacrifices X creatures and you gain X life, where X is this spell's intensity.
All Chorus cards you own intensify by 1.

At the beginning of combat on your turn, choose up to one target artifact or land you control that isn't a creature or token. Until end of turn, it becomes a 3/3 Spirit creature with vigilance and double team in addition to its other types.

Brazen Boarding deals 4 damage to target creature or planeswalker. If excess damage is dealt this way, conjure a card with mana value equal to that excess damage from Brazen Boarding's spellbook onto the battlefield. If that excess damage is 4 or greater, instead conjure a card named Admiral Beckett Brass onto the battlefield.

Trample, Haste
Whenever Scalesoul Gnome deals combat damage to a player, discover X, where X is that damage.
Whenever you play a card from exile, conjure a duplicate of it into your hand.

Fathomless descent — Each creature card in your graveyard perpetually gets +X/+X, where X is the number of permanent cards in your graveyard. Then return a creature card from your graveyard to the battlefield.