I might have an interesting balancing idea around hearthstone battlegrounds.
Pokey thornmantle could work exactly like Patient Scout - Your bloodgems have +1/+1 (Upgrades after each turn). Meaning it won’t be possible to explode with drakkari and at the same time have another balancing notch with the +x/+x. Also you would have the benefit only while he is on the board and you will have the benefit immediately.