It isnt just a pre-requisite to cast your commander, it's also how you can make up for the fact that the non-bomb cards in this deck are often mediocre ways to ping each opponent for 1 damage
But the biggest chase cards are Jeweled Lotus, Mana Drain, Vampiric Tutor, and other powerhouse cards in extended art versions only found in Collector boosters
Burning-Rune Demon is similar to that and costs one less
Once per turn, you may turn a card with an inkwell symbol from your hand into face-down ink, becoming a resource that you can turn sideways to summon characters You use 60-card decks in Constructed, 40-card decks in Limited, and the official website has an excellent "how to play" section
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Its still more expensive than it was before the spike, but Im still glad I didnt buy any during that peak