Perhaps you have eight mana available and don't particularly feel like sacrificing a creature
While in DEF, she doubled the movement of all Thunder-types - again, basically the saving grace of her archetype, because a Twin-Headed Thunder Dragon that's constantly moving two squares will make most opponents crap themselves
You can only activate 1 "Sangen Kaimen" per turn
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[spoiler='Main Deck'] [spoiler='Monsters'] [spoiler='Valkyrie of the Earth (Run 3)'] EARTH/Level 3/Fairy During either player's turn, when a monster effect is activated: You can discard this card and 1 other "Valkyrie" monster
if a 1/1 is not worth a card, a +1/+1 counter certainly isn't