A five mana 4/4 is nothing to write home about, and +4/+4 is quite a big bonus when it enters the battlefield, but in a format full of Nissa, Voice of Zendikar and Gideon, Ally of Zendikar, chump blocking is a pretty normal occurrence
(Unless you're Ken Nagle, in which case you do it right to left.) However, there's an important distinction to make here: you need to see what you're actually going to want to cast at each mana cost, not what you can cast at each mana cost
This encourages you to play more Pokemon in your deck as you build your defenses while also managing to strike hard
Then every single instant-speed spell in your hand essentially becomes its protection
They are just a predefined token cards sometimes create
you can't cast it without sacrificing a creature, and you can't sacrifice additional creatures