Like most One Piece TCG cards, the value of Power Mochi depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Starter Deck 7: Big Mom Pirates)
Now let's apply this information, along with the pack distributions listed in the Magic Tournament Rules, to determine how likely we are to encounter copies of specific cards at each rarity in various Limited formats
Most gold cards can only go in one deck, which makes them much less valuable comparatively than their monocolored counterparts
Deck Speed and Strategy Alignment Your decks speed determines which dual land cycles perform best
Tigra, Feline Fury would fit best in a green-based lifegain or +1/+1 counter deck, especially in Commander where repeatable life gain (Soul Wardenstyle effects, lifelink creatures, or cards like Wellwisher, Prosperous Innkeeper, or Heliod, Sun-Crowned) can quickly stack counters and turn Tigra into a large trampling threat