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That reason is often enchantment-based ramp like Wild Growth and Utopia Sprawl that produce extra mana from one land, letting this produce an absurd 4 mana rather than a respectable 2

Giratina can make its own, and you don't want to interfere with Darkrai ex's Energy stockpile

To make matters worse, if a player summons a monster that big...or tries to...it can blow it up with its other effect.

In the early game, keeping one mana open to slaughter a two-drop is easy, and this effect will appear frequently enough that youll need to keep an eye out for a lone white mana and weigh the risk of a nonessential attack and losing your best attacker