Do devoid spells trigger Ramos, Dragon Engine's ability? I am guessing no, but wanted to make sure there is no weird rule interaction. Also I assume it doesnt trigger Invoke Prejudice either?
Yes, they do, but only because every spell triggers Ramos.
Devoid spells are colorless. Colorless spells have no color. Ramos’s trigger from a devoid spell won’t add any counters to Ramos.












