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You can put squad creature to good use after any of the many board wipes that fill this deck, helping you keep the battlefield clear for your troops to invade

At the cost of one mana and a sacrificed creature or enchantment, Ertai can counter any spell, letting you turn your enchantments into disruption

Functionally, Yuna's Whistle is a pseudo-cantrip that always replaces itself with a creature, and finding the creature gives you some +1/+1 counters too, so there's combat trick potential as well

It showed up a ton, was represented in 60% of Modern decks, and made for a huge part in the dominant Boros Energy deck

If you care about the condition but don't want to break the bank, a cleaner LP copy might satisfy your Charizard craving