This is a great ability for a two-ink card as it means that players will be able to potentially start knocking out their opponents weaker characters, just by using Skirmish and then challenging the damaged character
Ive checked and there are plenty of blue birds that cost 5 or more and fit a Radagast build and a birds-matter build including a nice Owlbear that gives you a card back
And my favourite interaction of all, Fiend Artisan can fetch Grist, the Hunger Tide, an alumn of last years Top 10 list
4/5 Kefka, Ruler of Ruin Color Indicator: Blue, Black, and Red Legendary Creature Avatar Wizard Flying Whenever an opponent loses life during your turn, you draw that many cards
Esper Sentinel acts on a similar base as Rhystic Study
This makes the cut because you can slide it into any deck with the right colors and go to town