Anki can attack directly using its effect, but it will only deal half of his attack. This can be "negated" by using Forbidden Chalice during damage step so that it will deal 3200 damage directly. But it is best not to battle a monster with Anki with Forbidden Chalice because he will not get his search effect.
Because the Special Summon its the effect of the UA Monster in the hand, not the effect of the UA in the field which you equipped with Forbidden Chalice.
Unless your opponent tried to use UA Midfielder's effect to make the switch (In any player turn & once per turn, UA Midfielder can switch in any other face-up UA in the field for other UA with a different name in your hand), ofc
The U.A. card that is able to switch places is the one that you have in hand, not on field. That's why chalice can't negate the special summon.
I dont get the effect with Anki, I saw it work when someone in WC did it and direct attacked me with 3200 but I try it and it asks me if I want to continue attack. I say yes and it forces me to attack a monster.