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The Mightstone and Weakstone

Legendary Artifact — Powerstone

When The Mightstone and Weakstone enters, choose one —
• Draw two cards.
• Target creature gets -5/-5 until end of turn.
{T}: Add {C}{C}. This mana can't be spent to cast nonartifact spells.
(Melds with Urza, Lord Protector.)

CMC
5
Mana cost
{5}
Color identity
C
Rarity
rare
Set
The Brothers' War Promos
Price
—
EDHREC rank
#2973
Buy on TCGplayer
The Mightstone and Weakstone card art
The Mightstone and Weakstone draws two cards and permanently pumps a creature when it enters — five mana for that package is fair, but the real reason to run it is that Urza, Lord Protector merges with it to form Urza, Planeswalker for free. Outside of that specific combo, it's a value artifact that earns its slot in artifact-heavy lists; inside it, it's one half of the most iconic payoff in Commander.

Best Commanders

Commanders with the highest synergy

01
Urza, Lord Protector

Urza, Lord Protector

96.2% of decks · synergy 0.92

Urza, Lord Protector runs The Mightstone and Weakstone in 96% of decks for one reason: the two cards meld into Urza, Planeswalker, a game-ending threat that costs nothing extra once both pieces are on board.

02
Gandalf the White

Gandalf the White

43.5% of decks · synergy 0.43

Gandalf the White can flash The Mightstone and Weakstone in at instant speed, then trigger its enters-the-battlefield effect a second time — doubling up on the draw-two and the +2/+2 counter without any extra setup.

03
Mishra, Eminent One

Mishra, Eminent One

29.9% of decks · synergy 0.29

Mishra, Eminent One creates a token copy of The Mightstone and Weakstone each combat, which means a fresh draw-two trigger every turn on top of the counters already accumulating on your creatures.

04
Urza, Prince of Kroog

Urza, Prince of Kroog

30.7% of decks · synergy 0.26

Urza, Prince of Kroog reduces artifact costs and cares about artifacts entering the battlefield, so The Mightstone and Weakstone slots in as both a cost-efficient threat enabler and a card-advantage piece that lines up cleanly with the deck's artifact-creature payoffs.

05

Tetzin, Gnome Champion

22.9% of decks · synergy 0.22

Tetzin, Gnome Champion rewards artifact enters-the-battlefield triggers with treasure and Gold tokens, and The Mightstone and Weakstone's entry trigger stacks on top of that resource engine while still advancing the board with its +2/+2 counter.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern legal
pioneer legal
standard not legal
vintage legal
pauper not legal
oathbreaker legal

Commander is where The Mightstone and Weakstone actually matters — the meld payoff with Urza, Lord Protector is a tournament-level combo in the format, and outside that shell it's a respectable artifact that refills your hand and grows a threat. In Legacy and Vintage it's legal but sees essentially no play; five mana for two cards and a counter doesn't move the needle in formats where the competition is Ancestral Recall and Treasure Cruise. Modern and Pioneer are similar stories — The Mightstone and Weakstone is too slow and too narrow for competitive constructed, with no equivalent meld partner to justify the slot. Stick to Commander, and specifically to any deck that can abuse enter-the-battlefield triggers or assemble the Urza meld.

Key Combos

Combo lines featuring this card

Price Context

Current price

unknown tier

Pricing data isn't available for The Mightstone and Weakstone right now, so check Scryfall or TCGPlayer for a current number before buying. Given its near-universal inclusion in Urza, Lord Protector decks and its role as one half of a splashy Commander combo, expect it to carry a modest premium over a bulk rare — it's not a casual throw-in.

Explore

Sources

Mentioned

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Updated . Data from Scryfall, EDHREC, and Commander Spellbook.