We will take a look at this particular (absolutely 100% fake) Magic: the Gathering card.
Now, the name and image aren't really important, so from the top:
Cost: 7. Note that is is all colorless, which means it's splashable into any deck that will have it. However, there is an obvious drawback with:
Loyalty: 3. For seven mana, this is pretty low. It's balanced somewhat by colorless mana (which is traditionally worth less than colored mana). Negi will be dying relatively early, though, without assistance (a single Lightning Bolt will wipe him out.)
Abilities: Has a static, an activated, and two planeswalker types. Only the static ability is able to add loyalty counters.
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Static: This is what helps Negi stay alive. One can add multiple counters at any time, but countering a spell is primarily blue's thing (the other colors can psuedo-counter, though, by negating targets).
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Activated: Negi creates doppelgangers of sorts (in line with one of his early abilities, the ability to summon numerous wind clones). These clones can serve as a chump blockers or their intended purpose, to create counter opportunities so Negi can grow.
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(-3): It's a simple ability... instant knowledge, with the cost paid at the end of the turn. Possibly can be used the instant he shows up, turning the planeswalker into a seven-mana sorcery with single creature creation with some serious card draw. In universe, it's like pushing oneself to pulling out moves you didn't think of, but later, you forget what you were going to do.
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(-20): Not meant to see serious use, really. However, when Negi turns into a creature, he keeps all his abilities (as proof, see Gideon Jura "lose all abilities", and a ruling that involved turning planeswalkers into artifact creatures), which means he still gains loyalty counters to use his -3 ability, and still has the activated ability. He even keeps his -20, so in the off chance you need to, you can reset his power/toughness. While a creature, he's able to be a spectacular blocker while being able to go on the offensive.
Overall: It's a colorless planeswalker. Shouldn't be that hard... in a dedicated counter deck, it could see some serious use. Outside of one, however, it's use is limited to a VERY expensive distraction. Early game, it's a dead draw... and it may be too late by the endgame to really use him to his fullest.