You probably can't haste up everything, but a few timely haste threats with a permanent +1/+1 should be enough to get the job done
One of the best cards for this is Leafkin Avenger, which lets you gain mana for each creature you control that has power four or higher, and use that mana to remove creatures or planeswalkers
If you have multiple commanders, the lieutenant effect will happen as long as you control at least one commander
It's a traditional creature lord, bestowing +1/+1 to all your other skittering Squirrels
Creature Artifact - Construct Color tag templates(None) Sun Titan Vigilance Whenever this creature enters or attacks, you may return target permanent card with mana value 3 or less from your graveyard to the battlefield
While it looks much stronger than the Mothman in general, it doesnt interact with the +1/+1 counter theme at all, so Im sticking with West Virginias cryptid of choice out-of-the-box