Evolution Sage proliferates every time a land enters the battlefield under your control, turning your regular land drops into more value and infusing ramp spells with bonus effects
The second ability relates directly to good humans like Champion of the Parish and Thalia's Lieutenant since you can create human tokens at instant speed
Dont hold back
That said, the cards I loved the most from Yugioh were the big juicy 'pay life' cards, stuff like Mirror Wall could be devastating (better than Mirror Force if you have a reasonable board!), Solemn Judgement was insane, both were cards people in my meta hated because you paid life (they never noticed that Mirror Wall was a Trap card or something idk, I had played Magic before at least), these were among my favorite cards, at least I got my Judgement really easily, they thought it was a terrible card, I mean, half your life for a better Force of Will, who would play THAT poop tier card (I obviously would lol)
(7/18/2014) If Stormtide Leviathan loses its abilities, all lands on the battlefield (including those that enter the battlefield later on) will still be Islands in addition to their other types and will still be able to tap to produce