Thundering Mightmare
Creature — Horse Spirit
Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)
As long as Thundering Mightmare is paired with another creature, each of those creatures has "Whenever an opponent casts a spell, put a +1/+1 counter on this creature."
- CMC
- 5
- Mana cost
- Color identity
- G
- Rarity
- rare
- Set
- Magic Online Promos
- Price
- —
- EDHREC rank
- #10231
Thundering Mightmare dumps a pile of +1/+1 counters across your board the moment it enters, and it keeps doing it every combat — that's the whole pitch. The cost is real: five mana is a steep ask, and if it eats a removal spell before combat, you've lost the upside entirely. In counter-centric builds, particularly around Skullbriar, the Walking Grave, that risk is worth taking.
Best Commanders
Commanders with the highest synergy
Skullbriar, the Walking Grave
Skullbriar, the Walking Grave retains counters through zones, so every trigger from Thundering Mightmare translates into permanent stats that survive even after Skullbriar dies and comes back — it's one of the cleanest ways to snowball Skullbriar into a one-shot threat fast.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | not legal |
| pioneer | not legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
Thundering Mightmare is a Commander card through and through — the effect scales with the number of creatures you control, and 100-card singleton decks give you the density of counter synergies needed to make each trigger matter. In Legacy and Vintage it's technically legal but faces a speed problem: five mana for a creature with no immediate protection gets ignored in formats that win on turns two and three. Commander is where it belongs, specifically in decks built around +1/+1 counter accumulation, where the recurring combat trigger compounds quickly.
Key Combos
Combo lines featuring this card
Price Context
Current price
unknown tier
Pricing data for Thundering Mightmare isn't available in the current index, so check Scryfall or TCGPlayer for the live market price before buying. Given its role as a build-around in counter-heavy Commander decks, demand tends to track closely with the popularity of commanders like Skullbriar, the Walking Grave.
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Sources
Mentioned
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.