If the copied creature is copying something else, then the token enters as whatever that creature copied, with the listed exception
When it's defeated, exile it, then cast it transformed.) When Invasion of Ulgrotha enters the battlefield, it deals 3 damage to any other target and you gain 3 life
The damage is on the low side but the CMC for the spells are low too so it's possible to increase the damage that turn with a Solphim, Mayhem Dominus or a City On Fire
Since I'm not convinced Invasion of Tarkir is worth playing outside of a Dragon deck and there aren't currently any top-tier Dragon decks, I'm going to put it in B-tier, although the card should be very, very good in a Dragon deck
Due to that, Wizards said that the card will begin its life on both the Commander and Brawl ban lists
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