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Which means, making sure you have enough mana to cast counterspells, mill, damage, or loop back to the start through Time Reversal for yourself as necessary, even after counting the 12 CMC of EtI

If you want fun pack opening with chase-card potential, also consider The Lost Caverns of Ixalan, Outlaws of Thunder Junction and older high-interest sets when pricing is sensible

My friends gasp in horror when I admit this

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If they have a bad creature, they just sacrifice that

While it may be the tip of the mana curve iceberg, it's the core idea behind them based on archetypes