This creature can attack as though it had haste unless it entered this turn
[C][C] Claw Hunt: 150 damage
I run Draining Whelk in a bunch of my Commander decks for y'all, as one example, as well as Mystic Snake, Voracious Greatshark, and Overcharged Amalgam
With Dark Rituals, the Rat deck would often stabilize faster, such that if it were on the play, by turn 5 it might have three or even four Rats in play before the Hero can press the Rat deck below 10 life
Tinker was one of the many reasons that the Urza block became so powerful and is banned or restricted in every format
Your MTG colors mean you can't phase out with Teferi's Protection, and your deck is naturally geared towards ridiculously large spells, not cheap damage-dealing creatures that can chip in for the win once you're all top-decking