It may be exciting if you draw a rare card like Sephiroth, Fabled SOLDIER, but if it's your only good card that uses black mana, you may not want to build a deck around it
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It has vigilance, allowing it to attack without tapping, and the ability to pay one white mana and tap five attacking Templar Knights in order to search your library for any legendary artifact and put it directly into play
If there is a card that synergizes very well with your commander, make sure it fits within your commanders color identity
For Lapras GX, this is Ice Beam GX, which deals 100 damage and Paralyzes your opponents Pokemon
Why make yourself vulnerable like that when it's only 3 life per turn and the damage to your opponent doesn't matter much