When you discard a creature with a keyword like flying or deathtouch, you get to give Indominus Rex a corresponding counter
Mono red decks will have a hard time setting up for this combo, as they dont have reliable ways to find the pieces, but if you add blue or black, tutors like Trinket Mage and Vampiric Tutor can help you assemble the pieces without slowing you down, ensuring you are able to keep up with early mana rocks and ramp spells with ease
The last thing that Wizards of the Coast wanted was to be known as was a combination of Dungeons and Dragons and Poker, so ante was abandoned
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If youve got a small creature you prefer to be something else, it can do that, and if theres an opposing threat that cant be destroyed, it can deal with that too