You can afford to have the odd card, or far end of your range, under catered for
Thanks to her wording specifying "each opponent", you can benefit from Nymris' trigger up to three times per round if you happen to have enough instant speed spells and the mana to cast them
Solar Transfer lets you freely move Grass Energy around, while Jungle Dump delivers 240 damage and heals 30, making it tough to topple
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Cheap, mana-light cards like Terminate, Lightning Bolt, Oxidize, Vandalblast, and Path to Exile all come to mind
Some cards are still more powerful or efficient than others, but the balance of mana costs keeps things in relative check throughout the course of a game