Kefkas ability to wear down your opponents while helping you keep a steady supply of new cards feels extremely relevant to the current midrange meta in cEDH, although Im not sure that he will outperform Tymna the Weaver // Kraum, Ludevics Opus
Avenging Hunter I really like the initiative
Most of your characters have good stats for banishing their rivals in challenges, and if they don't there are easy ways to pump them up, either with a song, or as the side effect of a song
1 in 6 Play Boosters contains a Western landscape basic land
He is a little heavy at a three cost 2/2 but, his passive effect can buff himself each turn, as well as other creatures
Emiel the Blessed Blinking a creature for 3 mana opens Emiel the Blessed up to infinite combos with Peregrine Drake