Marvel Super Heroes (MSH)

Power-up

The rule

An ability each permanent can activate only once, usually putting counters on it; its cost is reduced by the permanent's mana value if it entered the battlefield this turn.

In play

It is a late-game mana sink: the creature costs little at first and grows when you have spare lands, or right away if you have the mana the turn it arrives.

The archetypes that lean on it

The other mechanics of the set

The Power-up cards, ranked

Ranked by win rate when the card is in hand (the cards with few games follow, by pick rating).