論理の結び目/Logic Knot

Instant -
Delve (You may exile any number of cards from your graveyard as you cast this spell. It costs {1} less to cast for each card exiled this way.) <CR>
Counter target spell unless its controller pays {X}.

Instant -
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) <CR>
Counter target spell unless its controller pays {X}.

Instant -
Delve (You may remove any number of cards in your graveyard from the game as you play this spell. It costs {1} less to play for each card removed this way.) <CR>
Counter target spell unless its controller pays {X}.

Instant -
Delve (You may exile any number of cards from your graveyard as you cast this spell. It costs {1} less to cast for each card exiled this way.) <CR>
Counter target spell unless its controller pays {X}.