Similarly, any "as [this creature] enters the battlefield" or "[this creature] enters the battlefield with" abilities that a token has copied will also work
When it enters, creatures get -X/-X, which can wipe tokens or shrink larger threats into range
In order to answer that question, the most important thing to look at for Masters sets is their role as sources of price alleviating reprints
While a 6/6 creature is not all that imposing, Deep Spawn has the ability to make itself untargetable until end of turn for just a single blue mana, effectively has some form of evasion with the Trample ability, and also mills cards from the top of your deck in to your graveyard during your upkeep (which can fuel further reanimation shenanigans on future turns)
Other Card Choices Delney, Streetwise Lookout can make Arabellas attack trigger happen twice, which can be game-ending later on
To me its important I can input cards without needing to use my mouse