Squall, SeeD Mercenary Squall here is a solid creature, with what is essentially an exalted trigger for double strike, and can resurrect small creatures if he gets through making him a potentially large source of damage and card advantage
Scurry Oak is the weaker of the two, as it's hard to get the counters on it to generate the tokens by itself
Plumecreed Mentor One generic, one white, one blue creature Bird Scout 2/3 Uncommon Flying Whenever Plumecreed Mentor or another creature you control with flying enters, put a +1/+1 counter on target creature you control without flying
It was also the most downloaded smartphone game with more than half a million downloads in 2016
If I'm getting hit by my own card, it had better be because I really need that effect and there aren't other options, or because I can mitigate the impact