Creature types like elves, kithkin, faeries, boggarts, merfolk, treefolk, and elementals all appear with abilities and effects that incentivize focusing specifically on creature types in your deckbuilding
Then once hes big enough, you get a bigger body and a super strong effect
collections_bookmark Part of Tarkir Dragonstorm Card Preview Dracogenesis Enchantment Tarkir: Dragonstorm (TDM) 1% Decklist Inclusion Times Brought 147 Decks Running 83 In Decks 650 Decklist Inclusion 1% Format Final zone distribution 39 instances 5.1% Library 33.3% Battlefield 17.9% Graveyard 7.7% Exile Commanders that played this card in tracked games 1 The Ur-Dragon 46 decks 2 Miirym, Sentinel Wyrm 10 decks 3 Ureni of the Unwritten 8 decks 4 Tiamat 7 decks 5 Atarka, World Render 4 decks 6 Lathliss, Dragon Queen 2 decks 7 Acolyte of Bahamut 1 decks 8 Kaalia of the Vast 1 decks 9 Najeela, the Blade-Blossom 1 decks 10 Ramos, Dragon Engine 1 decks The "good card" funnel 147 brought 82 players Brought to game 147 Ever drawn 36 Reached battlefield 22 Still on board at game end 13 Once cast, 59% of this card is still on the battlefield at game end

Its better in ramp decks and in 1v1 matches, of course, and the card sees sideboard play in some formats due to its resilience, especially when you know your opponents wont have Path to Exile in their hands
If you're scrapping for the cheapest but most effective mana base you can get, this will do nicely
(2023-02-04) Elesh Norn's first ability doesn't copy the triggered ability