Cheapest priced copy (Dominaria): $0.39 at Card Kingdom, near mint, their price list as of .
Grunn, the Lonely King 
Legendary Creature — Ape Warrior · 5/5 · Uncommon · Dominaria · #165
Kicker {3} (You may pay an additional {3} as you cast this spell.)
If Grunn was kicked, it enters with five +1/+1 counters on it.
Whenever Grunn attacks alone, double its power and toughness until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.39 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria | 165 | Uncommon | $0.39 | $2.49 |
| Dominaria Promos | 165s | Uncommon | — | $2.49 |
9 rulings from Wizards of the Coast
- 27 April 2018If an effect instructs you to "double" a creature's power, that creature gets +X/+0, where X is its power as that effect begins to apply. The same is true for its toughness.
- 27 April 2018A creature attacks alone if it's the only creature declared as an attacker during the declare attackers step (including creatures controlled by your teammates, if applicable). For example, Grunn's last ability won't trigger if you attack with multiple creatures and all but one of them are removed from combat.
- 27 April 2018If a creature's power is less than 0 when it's doubled, instead that creature gets -X/-0, where X is how much less than 0 its power is. For example, if an effect has given Grunn -7/-0 so that it's a -2/5 creature, doubling its power and toughness gives it -2/+5, and it's a -4/10 until end of turn.
- 8 November 2024If a spell's kicker cost was paid, the spell is "kicked."
- 8 November 2024The kicker ability doesn't let you pay a kicker cost more than once.
- 8 November 2024If a card or token enters as a copy of a permanent, the new permanent isn't kicked, even if the original was.
- 8 November 2024To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.
- 8 November 2024If you copy a kicked spell on the stack, the copy is also kicked. If the copied spell is a permanent spell, the token the copy of that spell becomes when it enters is also kicked.
- 8 November 2024If you put a permanent with a kicker ability onto the battlefield without casting it, you can't kick it.