It has an incredibly thoughtful approach to the learning process out there
This set introduces Colorless Mana as a distinct sixth type, along with the new mechanics Cohort and Support, while continuing Devoid and Surge from Battle for Zendikar
At those cost, they can have powerful effects but still be fair, they can win the game if left unchecked but be vulnerable to spells and/or creatures, they can protect themselves from one but not the other, they can generate card advantage repeatedly, etc
Im staying away for now
Any time a Cat attacks on your behalf, you can also pay three mana (1 colorless, one green, one white) to give it Trample and +X/+X for the rest of the turn
After starting this deck tech series with Witherbloom, the Balancer , it is time to move from Golgari value to Simic inevitability with Quandrix, the Proof