Your opponent eventually fails to pay for Illusions, sacrifices it, and loses 20 life
I mean, Im glad they were recording when I found out there were just a bunch of random G.I
Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell
The activated ability is super expensive for what it is, and cost reduction barely matters in Limited
Its not just confined to mono red, however, and there are some rather sneaky ways to utilize it
Blue lends you access to the usual card draw options to make sure you always have the tools you need while Green has a number of Sorceries to buff your creatures strength and add keywords