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Describe the Bug:
Myr Reservoir 's second ability can be used when it's tapped.
Additionally, if there's exactly 2 artifact creatures in the graveyard and only one of them is a Myr, one has to click the non-Myr creature in order to raise the Myr.

Which card did behave improperly ?
Myr Reservoir

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
BotG v2, duel

What exactly should be the correct behavior/interaction ?
Myr Reservoir 's second ability can't be used when it's tapped since its activation cost includes tapping it.
A targetted Myr card is returned from graveyard to hand.

Are any other cards possibly affected by this bug ?
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Edit1: confirmed by BAgate; Edit2: changed thread title to match new report guidelines

Confirmed 1st bug, but not 2nd. When I target a myr in my gy with one other artifact the myr is returned to my hand.

Also, if you use the 2nd ability and cancel you still are asked to seect a card from your gy with no effect.

BAgate wrote:When I target a myr in my gy with one other artifact the myr is returned to my hand.

Have you tried this with exactly one other artifact creature in the grave? Had the bug occur several times in separate games before I posted it. It's in the savegame, too.

Steps to reproduce:
1) Load savegame attached to original post. After loading, there will be three creatures in the graveyard: 2 Myr Retriever and 1 Arcbound Ravager.
2) Activate Myr Reservoir targetting one of the Myr Retriever s in the graveyard. (returns Myr) Clicking the Arcbound Ravager at this point returns a Myr, too, btw.
3) Activate Myr Reservoir targetting the Myr Retriever in the grave that you haven't targetted with Myr Reservoir yet. (does nothing)
4) Activate Myr Reservoir targetting the Arcbound Ravager in the graveyard. (returns Myr)

I had an Alloy Myr and a Baleful Strix in the gy, selected the Alloy Myr, and it was returned.

And wouldn't you know it, I go back to try it again and you need to click on the other artifact creature. When I had 3 artifact creatures including 1 myr then selecting a non-myr causes nothing to happen (but mana expended and Myr Reservoir taps).

Fixed in 263c0d4

2nd ability can still be used when tapped.

Also, if you use the 2nd ability and choose an invalid target it doesn't reject it, Myr Reservoir get tapped, the mana gets spent, but nothing happens. You should be required to choose a valid target.

All fixed in 4d307cb