This is a beloved mechanic for good reason: it draws cards, incentivizes attacking, and adds a fun and simple mini-game to the larger game of Commander
Even better, if you follow Nissa up by actually playing that Forest, and have seven or more lands, you can immediately flip her to her planeswalker half, allowing you to grab another land, draw a card, or make a 4/4
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[20] A 6x8" Pikachu card was included in Top Deck magazine
You can tap the Bird to add one mana of any color, setting you up for any missing colors you might be lacking on your next turn
Just remember that if you transform it into a planeswalker, it dies immediately, so dont do that