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On Play, it can give 1 of your Leaders +2000 power until the start of your next turn, and you cant add Life cards to your hand (at least, not with your own effects) during the same turn

However, this was not the regular Gyarados

the real danger in this card is that it makes blocking for your op-ponent absolutely miserable

How does that work

you can use the levels to shore up a creatures survivability with ward and outvalue opponents while holding open mana for responses

At the time, Magic: The Gathering didn't yet have a formal block design, and the designers wanted to make the game an anthology or treat it as a collection of similar games rather than a cohesive whole, so the fundamentals were open to change