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Planeswalker abilities can only be used at Sorcery speed. Apart from that, you're exactly right. Just note that the loyalty costs still apply, and your Kraj will start with zero loyalty counters, so you'll need to use the "everyone draws a card" ability first.

Activated abilities, unless something says otherwise, can be played as often as you can pay for them, whenever you have priority.

Something says otherwise in the case of Planeswalker abilities, namely the rules for the Planeswalker type. This creates a loophole - those rules don't apply to anything that is not currently a Planeswalker.

So if you make a Planeswalker a creature somehow, and get a +1/+1 counter onto it, Experiment Kraj gains its activated abilities without the usual limitations. It can give itself a number of loyalty counters equal to the number of particles in the universe using the planeswalker's "plus" ability then use the planeswalker's "ultimate" as many times as it needs to.

jeff-heikkinen wrote:

Activated abilities, unless something says otherwise, can be played as often as you can pay for them, whenever you have priority.

Something says otherwise in the case of Planeswalker abilities, namely the rules for the Planeswalker type. This creates a loophole - those rules don't apply to anything that is not currently a Planeswalker.

So if you make a Planeswalker a creature somehow, and get a +1/+1 counter onto it, Experiment Kraj gains its activated abilities without the usual limitations. It can give itself a number of loyalty counters equal to the number of particles in the universe using the planeswalker's "plus" ability then use the planeswalker's "ultimate" as many times as it needs to.

This answer is what I expected. However, the problem is in explaining it using the comp rules. Without comp rules, it would be open to interpretation.

When I do this, I'm fairly certain that I'll need these written down with me so that I can prove that I'm making a legitimate play.

There has to be some rule, somewhere, that deals with non-Planeswalker permanents gaining the abilities of a Planeswalker.

Biomechanika wrote:

This answer is what I expected. However, the problem is in explaining it using the comp rules. Without comp rules, it would be open to interpretation.

When I do this, I'm fairly certain that I'll need these written down with me so that I can prove that I'm making a legitimate play.

There has to be some rule, somewhere, that deals with non-Planeswalker permanents gaining the abilities of a Planeswalker.

The rules specify that a Planeswalker can only have one of its activated abilities activated on your turn when you could normally play a sorcery, and only once per turn per Planeswalker-in-play object (that is, a second copy of Jace if you kill the first one off by drawing a card can also have one of its abilities used). The rules do not say anything about the abilities printed on a Planeswalker; in the same scenario as you described, a 'Walker enchanted by Power of Fire couldn't tap for the PoF-granted ability if another ability had been used that turn, and vice versa. No matter how many activated abilities a 'Walker has and no matter how it got any of them, only one of those abilities can be used per turn, on your turn, when you could normally play a sorcery. Conversely, any non-Planeswalker permanent may have any number of activated abilities activated any number of times as long as you can pay the cost, even if those abilities are normally on Planeswalkers but somehow ended up on a non-'Walker permanent.

For example, if a spell ever read --> Target planeswalker becomes a creature with power and toughness equal to the number of loyalty counters on it as you play this spell. <-- The target planeswalker would stop being a Planeswalker, but it would still have its abilities and suddenly you could go hog-wild with playing its abilities. Obviously such a spell will never see print due to that very thing, but that's not the point of my example.