Freeze it
It also incentivizes playing Equipment with high equip costs since Equipment played from Galea's effect doesn't need to be equipped
In addition to the card's other abilities, it also has a card draw effect that activates after an opponent plays their second or more spell on their turn

Giants: Brion Stoutarm, Furystoke Giant, Giant Harbinger, Stonehewer Giant Equipment Package: Puresteel Paladin, Mask of Memory, Nim Deathmantle, Sword of the Animist, Sunforger, Masterwork of Ingenuity Haste: Slayers' Stronghold, Flamekin Village, Fervor, Hammer of Purphoros, Anger Ramp: Myriad Landscape, Knight of the White Orchid, Burnished Hart, Solemn Simulacrum, Wayfarer's Bauble, Chromatic Lantern, Coalition Relic, Commander's Sphere, Semblance Anvil, Unstable Obelisk, Hedron Archive Creature Removal: Chained to the Rocks, Swords to Plowshares, Pyrohemia (wombo combo with Gisela, Blade of Goldnight), Volcanic Offering, Day of Judgment Other Removal: Vandalblast, Hallowed Moonlight, Rest in Peace, Return to Dust, Wear // Tear, Austere Command Tutors: Relic Seeker, Steelshaper's Gift, Tithe, Gift of Estates Draw: Prophetic Flamespeaker, Commune with Lava, Outpost Siege Protection: Legion's Initiative, Boros Charm Recursion: Emeria Shepherd Utility: Iroas, God of Victory, Mimic Vat Put it all together and here's a $20 sample upgrade list: Here is the Wade Into Battle deck with the recommended card swaps: Budget-less Upgrades There aren't any pricey Giants left to pick up, but there's still plenty of money cards you can toss in to make the deck better: Equipment Package: Stoneforge Mystic, Sword of Feast and Famine, Sword of Fire and Ice, Sword of Light and Shadow Removal: Path to Exile Tutors: Land Tax, Expedition Map Ramp: Gilded Lotus, Thran Dynamo Lands: Homeward Path, Mistveil Plains, Battlefield Forge, Clifftop Retreat, Plateau, Arid Mesa, Ancient Tomb That's All of 'em

Invasion of Segovia is a perfect example: It creates Kraken tokens, so its already synergistic, and it makes fodder for Jalira, but its not a creature card, so this otherwise subpar hit wont ever be the card you find with Jaliras polymorph ability
It plays a mana game that puts your opponents behind on mana and you up on cards