Mass Diminish
Sorcery
Until your next turn, creatures target player controls have base power and toughness 1/1.
Flashback 
(You may cast this card from your graveyard for its flashback cost. Then exile it.)
- CMC
- 2
- Mana cost
- Color identity
- U
- Rarity
- rare
- Set
- Commander 2019
- Price
- $1.63
- EDHREC rank
- #8643
Mass Diminish turns every creature your opponents control into a 1/1 until their next end step — for three mana at instant speed — which is a backbreaking swing in any board state. It's a staple in Toxrill, the Corrosive builds and earns a slot in any blue deck that wants to punch through a wall of blockers or reset a battlefield full of problem creatures.
Best Commanders
Commanders with the highest synergy
Toxrill, the Corrosive
Toxrill, the Corrosive puts a slug counter on every creature that didn't die, and Mass Diminish making everything a 1/1 means Toxrill's end-of-turn trigger is wiping entire boards rather than just nibbling at them — the two cards form a near-unconditional mass removal engine.
Neerdiv, Devious Diver
Neerdiv, Devious Diver cares about dealing combat damage with small creatures, and Mass Diminish leveling every opposing blocker to a 1/1 clears the path for exactly that — the instant timing means you can hold it for the attack step and only spend it when evasion actually matters.
Sephiroth, Planet's Heir
Sephiroth, Planet's Heir wants to accumulate Crisis counters by connecting in combat, and Mass Diminish at instant speed turns a board full of walls into a free highway — it doubles as a protection spell when the table tries to swing lethal through your smaller creatures.
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 |
Commander is where Mass Diminish does its best work: multiplayer boards regularly hit six to ten creatures, which means a three-mana instant that blanks all of them has compounding value that would never exist in a two-player context. In Legacy and Vintage it's technically legal but sees no competitive play — there are more efficient answers to specific threats, and tempo-positive mass-shrink effects don't fit those formats' game plans. Oathbreaker is the one non-Commander 60-card context where Mass Diminish might pull real weight, since planeswalker-centric strategies can legitimately want a cheap instant to nullify an opposing creature swarm for a turn.
Key Combos
Combo lines featuring this card
Price Context
Current price
$1.63 cheap tier
At $1.63, Mass Diminish sits in the cheap tier and is straightforwardly worth it — a three-mana instant-speed mass effect at that price point has no budget excuse not to run it. It's not a card that fluctuates dramatically, so buy in whenever you need it.
Explore
Sources
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.