Lifegain decks often struggle to find enough ways to use their life as a resource, and Karlov lets you effectively do so without actually losing the life
Glissa, Herald of Predation FromTheShire: Regular readers can probably predict where I'm going with this right away - I don't give a damn about Incubating, I'm windmill slamming first strike and deathtouch Every
Im unsure what to replace her withSorcerous Spyglass, Crushing Canopy, and Knight of Autumn are all possibilities for the fifteenth sideboard slot
If you make opponents lose life, you get a kind of Snapcaster Mage effect with cost reduction
Honorable Mention #3: Sarkhans Unsealing Sarkhans Unsealing is another card that bears more than a passing resemblance to previous Red enchantments that also dish out damage based on the size of your creatures
Multicolored Admiral Beckett Brass: That is one difficult clause to jump through, but if you do, especially in EDH, you could be taking over some really powerful nonland permanents one a turn