Tam, the Possibility
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Cheapest priced copy (Reality Fracture): $0.49 at Card Kingdom, near mint, their price list as of .

Tam, the Possibility {1}{G}{U}

Legendary Creature — Gorgon Wizard · 2/4 · Rare · Reality Fracture · #317

Planeswalker spells you cast cost {1} less to cast.

{W}{U}{B}{R}{G}, {T}: Proliferate X times, where X is the number of planeswalker types among planeswalkers you control. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.)

3 printings · $0.49 to $4.99 at Card Kingdom
SetNumberRarityCard KingdomFoil
Reality Fracture276Rare$0.49$0.49
Reality Fracture317Rare$0.99$4.99
PFRA276pRare$0.69$0.79
10 rulings from Wizards of the Coast
  1. 21 August 2026If 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.
  2. 21 August 2026The value of X is determined only once, as Tam's last ability resolves.
  3. 21 August 2026You don't have to choose every permanent or player that has a counter, only the ones you want to add another counter 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.
  4. 21 August 2026If a permanent ever has both +1/+1 counters and -1/-1 counters on it at the same time, they're removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it.
  5. 21 August 2026An ability that triggers "Whenever you proliferate" triggers even if you chose no permanents or players while doing so.
  6. 21 August 2026To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
  7. 21 August 2026Players 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.
  8. 21 August 2026If you proliferate multiple times, you don't have to choose the same set of players and/or permanents to get additional counters each time.
  9. 21 August 2026While proliferating multiple times, players can't respond between proliferating the first time and proliferating the second time, and so on.
  10. 21 August 2026To 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.