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Some card draw cards like Argothian Enchantress can be a bit pricey, and Siona, Captain of the Pyleas is an acceptable replacement for those

Infernal Grasp Infernal Grasp is one of the best 2-mana removal spells black has to offer

Imagine casting Rolling Earthquake for X=4

If you cast a card without paying its mana cost," you cant pay any alternative costs, such as emerge costs

You can then use Pili-Palas untap ability with these two colorless mana to gain one mana of any color and repeat the loop as many times as you want

I have chosen these cards purely on their design and how they are effective at doing what I have been describing