mtg tribal card type Unity | Onslaught What are good tribal cards

Let's get down to specifics, shall we

Each Foundations Starter Collection includes 26 Traditional Foil cards, 361 regular cards (including 90 Lands, 10 of which are Full-Art), 3 Play Boosters (each containing 14 cards), 13 double-sided tokens, 1 Deck Builder's Guide booklet, 2 reference cards, 1 click-wheel life counter, and 1 card storage box

That makes it a shoe-in for green Commander decks looking for more ways to ramp

38 lands in an elves deck which originally has its abilities focused on mana doesn't seem to be something that interesting, so the number was reduced to 34 (already considering the land alterations which are to come)