Squash

This spell costs {3} less to cast if you control a Giant.
Squash deals 6 damage to target creature or planeswalker.

Thunderscape Familiar

First strike
Black spells and green spells you cast cost {1} less to cast.

Chardalyn Dragon

Scrapwork Cohort

When this creature enters, create a 1/1 colorless Soldier artifact creature token.
Unearth {2}{W} ({2}{W}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Stonybrook Banneret

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Merfolk spells and Wizard spells you cast cost {1} less to cast.

Stinkdrinker Daredevil

Giant spells you cast cost {2} less to cast.

Insatiable Souleater

{G/P}: This creature gains trample until end of turn. ({G/P} can be paid with either {G} or 2 life.)

Foundry Inspector

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

Bosk Banneret

Treefolk spells and Shaman spells you cast cost {1} less to cast.

Goblin Replica

{3}{R}, Sacrifice this creature: Destroy target artifact.

Undersea Invader

Flash (You may cast this spell any time you could cast an instant.)
This creature enters tapped.

Thornscape Familiar

Red spells and white spells you cast cost {1} less to cast.

Hamlet Glutton

Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.)
This spell costs {2} less to cast if it's bargained.
Trample
When this creature enters, you gain 3 life.

Sea Gate Colossus

This spell costs {1} less to cast for each creature in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)

Goblin Electromancer

Instant and sorcery spells you cast cost {1} less to cast.

Ballyrush Banneret

Kithkin spells and Soldier spells you cast cost {1} less to cast.

Frogtosser Banneret

Haste
Goblin spells and Rogue spells you cast cost {1} less to cast.

Universal Automaton

Changeling (This card is every creature type.)

Etherium Sculptor

Dragonlord's Servant

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

Brighthearth Banneret

Elemental spells and Warrior spells you cast cost {1} less to cast.
Reinforce 1—{1}{R} ({1}{R}, Discard this card: Put a +1/+1 counter on target creature.)

Sunscape Familiar

Defender (This creature can't attack.)
Green spells and blue spells you cast cost {1} less to cast.

Nightscape Familiar

Blue spells and red spells you cast cost {1} less to cast.
{1}{B}: Regenerate this creature.