mtg cards with level up in MTG: Rules, History, and Best put a +1/+1 counter on enchanted creature o:"level up" · Scryfall Magic:

When you put a lore counter on it, you trigger the effect that matches the number

The restriction, for me, is the deciding factor

Each turn, he rewards each of your non-combative creatures with a +1/+1 counter and a free untap

It costs four for an artifact and when it ETBs you can discard any number of card and draw that many plus one

It is value and empowerment, it is a support card not a payoff really and so it needs to be cheaper than four mana

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