Skrelv, Defector Mite does not give priority
It seems like this card is not correctly giving priority in response to spells (eg those targeting it or other creatures), regardless of whether you have W or 2 life to pay.
Repro: Skrelv being targeted with removal, having W open (and more than 2 life)
Expected: Receive priority with the spell or ability on the stack.
Actual: Arena continues without letting you activate the ability to put it on another creature before it dies.
Did Skrelv have summoning sickness by any chance? IIRC summoning sickness should prevent him from being able to use his ability....