15 more formats
Confidence:StrongSolidPlausibleTentativeSpeculative
- InstantU
Intellectual Offering untaps all (or many) permanents, refreshing Giant's Boulder's tap activation.
- Creature — Elf DruidG
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- EnchantmentU
Unstoppable Plan untaps all (or many) permanents, refreshing Giant's Boulder's tap activation.
- ArtifactC
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- ArtifactC
Unwinding Clock untaps all (or many) permanents, refreshing Giant's Boulder's tap activation.
- Creature — SpiritG
Seedborn Muse untaps all (or many) permanents, refreshing Giant's Boulder's tap activation.
- ArtifactC
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- Creature — Human SpellshaperU
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- ArtifactC
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- Legendary ArtifactC
Paradox Engine untaps all (or many) permanents, refreshing Giant's Boulder's tap activation.
- Creature — Human WizardU
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- ArtifactC
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- Legendary Creature — Human RogueR
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- InstantU
Dramatic Reversal untaps all (or many) permanents, refreshing Giant's Boulder's tap activation.
- Artifact Creature — Vedalken WizardU
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- Legendary ArtifactW
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- Creature — Elf Cleric DruidG
One-directional refresh: one card can untap permanents the other wants to reuse. Not self-sustaining on its own — the untapper has to keep showing up.
- InstantU
Blinkmoth Infusion untaps all (or many) permanents, refreshing Giant's Boulder's tap activation.
- Legendary Artifact Creature — HumanBRW
Mana loop: net-positive mana cycle between the two cards.
- Legendary PlaneswalkerW
The Eternal Wanderer blinks (exiles and returns) a permanent, re-firing Giant's Boulder's enter-the-battlefield effect.
- SorceryW
Jolted Awake returns creatures from the graveyard to the battlefield, re-firing Giant's Boulder's enter-the-battlefield effect.
- Legendary Creature — DogW
Phelia, Exuberant Shepherd blinks (exiles and returns) a permanent, re-firing Giant's Boulder's enter-the-battlefield effect.
MTG Arena only
Synergies with cards played only on MTG Arena (including Arena rebalances). They aren't available in paper Magic.
Confidence:StrongSolidPlausibleTentativeSpeculative
- Creature — Human ArtificerU
Mana loop: net-positive mana cycle between the two cards.
- Legendary Creature — Dinosaur PirateR
Mana loop: net-positive mana cycle between the two cards.
Goblin Firebomb1ArtifactC
Universal Solvent1ArtifactC
Unstable Obelisk3ArtifactC
Urn of Godfire1ArtifactC
Mana Cylix1ArtifactC
Candy Trail1Artifact — Food ClueC
Iron Suitcase1ArtifactC
Lunatic Pandora1Legendary ArtifactC
Thaumaton Torpedo1ArtifactC
Bronze Walrus3Artifact Creature — WalrusC
Sentinel Totem1ArtifactC
Witching WellUArtifactU