Sure you can build a purple deck that actually has a lot of card drawing abilities but even without purple, competitive or experienced players dont have this issue
1 token/ad card, Helper card, or a special card fromMagic's historyfound in 25% of packs
The static ability also hurts a surprisingly large number of common cards, including the very popular Etali, Primal Conqueror
This allows you to perfectly protect yourself from creatures until the time has come to assemble an infinite mana combo and dump it all into a Helix Pinnacle
Additionally, when Grimgrin attacks, you get to destroy a target creature an opponent controls, and you get to add another +1/+1 counter to it
The curve is low, thanks to a stack of mana rocks