First time using this, so I`m sorry if I`m doing it wrong...
anyway, I would like to know about "proliferate" ability.
Here is the thing:
An ability gives a creature a +1/+1 counter until the end of turn.
I proliferate that.
Do both +1/+1 counters are removed at the end of my turn or just the one which was given by the first ability?
There is no card with an effect that says to put a +1/+1 counter on something "until end of turn". Even Bounty of the Hunt doesn't do this.
However, an effect that says a creature "gets +1/+1 until end of turn" is not the same as putting a +1/+1 counter on that creature (the former is a continuous effect under C.R. 611.1, while the latter is a one-shot effect under C.R. 610.1; see also C.R. 613.3c). As a result, proliferating can't put a +1/+1 counter on that creature unless that creature already has a +1/+1 counter on it (C.R. 701.26a). In general, a counter is put on a permanent only if the effect says "put ... counter[s]", "give ... counter[s]", "move ... counter[s]" (C.R. 121.5), or "enter[s]" or "put ... onto" or "return ... to" "the battlefield ... with ... counter[s]" (C.R. 121.6). See also this thread.
EDIT (Apr. 17, 2020): Edited to conform to rule update with Ikoria: Lair of Behemoths.
Counters stay where they are, forever, unless something specifically tells you to remove them (or if the card leave the battlefield).
Be careful not to confuse cards that actually put counters on creatures wtih those other cards that simply grant a +X/+X bonus until end of turn.
anyway, I would like to know about "proliferate" ability.
Here is the thing:
An ability gives a creature a +1/+1 counter until the end of turn.
I proliferate that.
Do both +1/+1 counters are removed at the end of my turn or just the one which was given by the first ability?
Cheers mates!!!
Rafael
However, an effect that says a creature "gets +1/+1 until end of turn" is not the same as putting a +1/+1 counter on that creature (the former is a continuous effect under C.R. 611.1, while the latter is a one-shot effect under C.R. 610.1; see also C.R. 613.3c). As a result, proliferating can't put a +1/+1 counter on that creature unless that creature already has a +1/+1 counter on it (C.R. 701.26a). In general, a counter is put on a permanent only if the effect says "put ... counter[s]", "give ... counter[s]", "move ... counter[s]" (C.R. 121.5), or "enter[s]" or "put ... onto" or "return ... to" "the battlefield ... with ... counter[s]" (C.R. 121.6). See also this thread.
EDIT (Apr. 17, 2020): Edited to conform to rule update with Ikoria: Lair of Behemoths.
Be careful not to confuse cards that actually put counters on creatures wtih those other cards that simply grant a +X/+X bonus until end of turn.
You might want to have a look at rules 121 & 613.3:
https://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules
RULES OF MAGIC :
http://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules
Cheers!!!