It's a high cost to pay, but Shark Shredder, Killer Clone is already a 4/4, and if you can pull another high-power creature from your opponent's graveyard, you'll be doing huge damage, justifying the initial cost
But these first changes the big money cards are mostly the kind of enablers which will help any Stella list thrive
If you stick to these guidelines, you'll have a solid fundamental strategy from which to build your knowledge base
an opponent just has to have lost 3 life and you get 2 separate things: a 3/3 token, and card advantage in some way, which can be up to 3 cards drawn or discarded (or a mix)
For Ursula's Return, the Starter Decks are focused around two synergies
Zinnia's deck offers a powerful two-in-one strategy for players to utilize