Forum:This card cannot be special summoned unless...

i have cards like dark eradicator warlock and black luster soilder - envy of the begining, and its says you can special summon this card by doing what they say.

like for dark eradictor u need to tribute dark magican, and for black luster - EOTB u need to remove from play a light and dark monster. ok so if you do what they ask, can you special summon it from your deck

because its kind of weird out of no where in a duel i take out a light and dark monster from the grave yard, and my oppenent is like what are you doing. im summoning black luster from my deck, and then hes like it has to be from your hand. and same with dark eradicator

so yea i dont get it