This promo won't get much attention in imperfect condition, as copies below near-mint (NM) sell for as little as a few dollars, but NM copies will range between $11 and $15
Everything you want from a planeswalker is here: card selection and draw, tapping down a creature to protect itself, or making a literal ninja anthem emblem every turn
It can also be paired with Noxious RevivalNoxious Revival to mimic the Charmbreaker DevilsCharmbreaker Devils trick, or it can be paired with Angels GraceAngels Grace to act as another Sundial of the InfiniteSundial of the Infinite (or just be a repeatable FogFog)
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In addition to being able to provide card advantage, Nalia can help push damage through and bolster your forces, as at the beginning of combat on your turn, each creature you control gets a +1/+1 counter and deathtouch until the end of turn as long as you have a full party