With Dark Hole, Raigeki and Harpies Feather Duster, removing counter spells, traps and monsters was trivial - had you not already blocked them from being activated with control monsters like Jinzo or Imperial Order
Overall, Zombie Mammoth may not be the most optimal choice for competitive play compared to other Zombie support cards
You can only use each effect of "Scrap Raptor" once per turn
Heads: Halve all battle damage you take
When the last defense counter is removed, the battle is defeated, and the owner casts it transformed (regardless of who defeated it)
But as examples of very popular cantrips-on-a-stick, and given their steadfast service and dedication across countless decks and formats, I'd say they've earned their spot