Expansion Algorithm
Sorcery
Proliferate X times. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.)
- CommanderLegal
- StandardNot legal
- PioneerNot legal
- ModernNot legal
- LegacyLegal
- VintageLegal
- PauperNot legal
Our copies of Expansion Algorithm
Selling Expansion Algorithm?
We pay 50% of a card's market value in cash, or 70% in store credit, for cards worth more than $1. For the cheapest printing of Expansion Algorithm, that's about $1.28 cash or $1.79 in credit.
All 2 printings and prices
| Set | # | Released | Nonfoil |
|---|---|---|---|
| Secrets of Strixhaven Commander SOC | 69 | Apr 2026 | $3.22 |
| Secrets of Strixhaven Commander SOC | 19 | Apr 2026 | $2.55 |
TCGplayer market, near mint, Nov 9, 2026.
Rulings
When you proliferate, you can choose any permanent that has a counter, including ones controlled by opponents. You can choose any player who has a counter, including opponents. You can't choose cards in any zone other than the battlefield, even if they have counters on them.
If a player or permanent has more than one kind of counter on it, and you choose for it to get additional counters, it must get one of each kind of counter it already has. You can't have it get just one kind of counter it already has and not the others.
Players can respond to a spell or ability whose effect includes proliferating. Once that spell or ability starts to resolve, however, and its controller chooses which permanents and players will get new counters, it's too late for anyone to respond.
If you proliferate multiple times, you don't have to choose the same set of players and/or permanents to get additional counters each time.
You don't have to choose every permanent or player that has a counter—only the ones you want to add counters to. Since "any number" includes zero, you don't have to choose any permanents at all, and you don't have to choose any players at all.
While proliferating multiple times, players can't respond between proliferating the first time and proliferating the second time, and so on.
Card text, images and rulings from Scryfall. Magic: The Gathering and its card names, text and art are property of Wizards of the Coast.