Remember the set Rise of the Eldrazi? Well, I have a card from that set named Ulamog's Crusher. It is an 8/8 with annihilator 2 and attacks each turn. This card is a common. It can dominate. Do you think that this cards should be at least an uncommon? Thanks for feedback!
Not really. Ultimately, the rarity only has an influence on the price of the card by limiting supply. It's not really a major consideration to the power of the card. And Umalog's Crusher really isn't that good. It's an 8 mana card that has no impact until your next turn and no defenses (completely vulnerable to things like Day of Judgment and Doom Blade), making it wholely unimpressive compared to something like Primeval Titan or even Artisan of Kozilek, which have major impacts on the game as soon as they hit the field.