Cheapest priced copy (Eighth Edition): $4.99 at Card Kingdom, near mint, their price list as of .
Relentless Assault 
Sorcery · Rare · Planechase · #62
Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
17 printings · $4.99 to $57.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 225 | Rare | $5.49 | $24.99 |
| Classic Sixth Edition | 202 | Rare | $5.49 | — |
| Seventh Edition | 214 | Rare | $6.49 | — |
| Seventh Edition | 214★ | Rare | — | — |
| Eighth Edition | 214 | Rare | $4.99 | — |
| Eighth Edition | 214★ | Rare | — | $19.99 |
| Ninth Edition | 212 | Rare | $6.99 | — |
| Ninth Edition | 212★ | Rare | — | $24.99 |
| Commander Legends | 416 | Rare | $5.49 | — |
| Duel Decks: Merfolk vs. Goblins | 54 | Rare | $4.99 | — |
| Planechase | 62 | Rare | $5.99 | — |
| Marvel Universe | 25 | Mythic | $6.49 | $9.99 |
| Mystery Booster 2 | 132 | Rare | $4.99 | — |
| Portal Second Age | 115 | Rare | $7.49 | — |
| Portal Three Kingdoms | 119 | Rare | $57.99 | — |
| Starter 1999 | 115 | Rare | $5.99 | — |
| Visions | 91 | Rare | $5.99 | — |
4 rulings from Wizards of the Coast
- 19 September 2025Relentless Assault creates an additional combat and main phase only if it resolves during a main phase.
- 19 September 2025A creature that attacks each turn if able must attack only once that turn. It is not forced into each attack that turn. However, a creature that attacks each combat if able must attack again if it can.
- 19 September 2025If you manage to cast this during a main phase of your opponent's turn, that opponent's creatures will untap and that opponent will be able to attack again. It will not allow you to attack during their turn.
- 19 September 2025Abilities that trigger when a creature attacks, blocks, or is blocked will trigger during each combat that turn.