Card sets: base and jungle
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
Fossil Excavator Probably the best Supporter printed for decks that run fossils or fossil Pokmon
Arrow Legacys First Mate can work in aggro decks
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Additionally, Germination Practicum is ideal in +1/+1 counter decks, like The Wise Mothman or Shalai and Hallar