Gilder Bairn
Creature — Ouphe
, 
: Double the number of each kind of counter on target permanent. ( is the untap symbol.)
Do the glowing trinkets show it the way home, or do they set a twisted path for someone else to follow?
Illustrated by
The List#EVE-152UncommonEnglishLegality
Rulings
If the permanent is already untapped, you can’t activate its ability. That’s because you can’t pay the “Untap this permanent” cost.
The “summoning sickness” rule applies to . If a creature with an ability hasn’t been under your control since your most recent turn began, you can’t activate that ability. Ignore this rule if the creature also has haste.
When you activate an ability, you untap the creature with that ability as a cost. The untap can’t be responded to. (The actual ability can be responded to, of course.)
Gilder Bairn’s ability will replicate each kind of counter on the targeted permanent, not just +1/+1 or -1/-1 counters.