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Steady Progress allows you to choose any player, and put another counter on them, of a type that already is on them.

I am only aware of poison counters on players. Are there others?

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    Side note: proliferate (the mechanic that's on Steady Progress and another dozen or so cards) doesn't target. You just choose players and permanents; it doesn't matter if they're hexproof or otherwise untargetable. – Cascabel Oct 22 '15 at 1:09
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At present, there are three types of counters that can be placed on players.

  1. Poison (Originally seen in Legends, prevalent in Scars of Mirrodin block)
  2. Experience (Commander 2015)
  3. Energy (written as {E}) (Kaladesh)

We can search through Scryfall for cards that give players counters to determine that those are the only ones. As we can see with cards like Caress of Phyrexia and Aether Hub, cards that explicitly put specific kinds of counters on players use the wording

[Player] get(s) [amount] [counter description]

Since Scryfall supports regular expression search, we can turn that into a regular expression to search for cards with that wording. For now, let's see what we get if we pretend that counters are the only things players can get. We can search for that with the following regular expression:

re:"(player|opponent|you) (get|gets)\b"

This mostly finds relevant cards, but it also finds some irrelevant cards, including planeswalkers that grant emblems and Paradox Haze. So, we can also exclude cards that give players emblems or additional votes or steps, or make players get you something:

re:"(player|opponent|you) (get|gets)\b(?! (+|-|you|an (emblem|additional)))" -is:funny

This is the same search before, but it looks at the next word to exclude sentences like "target opponent gets you [something]", "you get an emblem", "that player gets an additional [something]", and "creatures attacking you get -1/-0". It also removes joke cards. This results in 83 cards, all of which put some sort of counter on a player. A visual inspection shows that they all add poison, experience, or energy counters.

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    how do you know this to be true? I accepted, because you seem to know everything about MtG, but is there an easy or straight forward way to determine the answer to this question? – John Oct 24 '15 at 11:32
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    I added an explanation of how to determine/verify this. Does that help? – murgatroid99 Oct 24 '15 at 17:28
  • @Jefromi I added that quotation to the answer – murgatroid99 Nov 2 '15 at 20:56
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    It's unfortunate that when someone creates such a significant rewrite, that so significantly improves an answer as murgatroid99 and doppelgreener have done on this answer, that we can't vote for that particular edit. Clearly this is a labor of love for both of you, and both of you are to be commended! Nicely done. – John Oct 4 '16 at 14:58

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