It's an Elder Wizard creature card, not an Avatar creature card
Whenever you cast a spell that targets one or more of your Creatures, the +1/+1 counter is placed on Arcee, Acrobatic Coupe, which is great, but she immediately Converts back to the Robot half that no longer receives +1/+1 counters
What set is Karlach, Tiefling Spellrager from
Bulk-friendly : Its one of the most common routes for printing hundreds of cards efficiently
Chaplain of Alms // Chapel Shieldgeist Ward 1 isn't a huge deterrent against targeted removal, but sometimes it's enough to keep your creatures alive for an extra turn
However, its ability means that its a harsh sacrifice for opponents to have to take to get rid of it