The three tiers each have a flavor word for additional well, flavor, but these words have no effect on gameplay
You dont gain much life each time, but Karlov cares about the number of times you tithe, not the overall value
If I had that cash I would absolutely drop it on a Charizard and the STS medal, but alas, I live in California that kind of money could barely get me a cardboard refridgerator box in the Tenderloin, and Id be one of the lucky ones (at least I could stand up in mine!)
How Can I Tell the Rarity of a Card
As proven by Austere Command, the ability to be flexible in what needs to be killed greatly increases its power even if it is killing creatures the large majority of the time
Instant Color tag templates(None) Return of the Wildspeaker Choose one Draw cards equal to the greatest power among non-Human creatures you control