It's always so cool to see old designs (in this case Leyline Angler) pop up in other people's cubes! This "I made that!" feeling is the best :)
I do wonder if Yahenni's Expertise isn't a bit too ambitious. Double black with only six black mana sources, seven if we count the Farseek? Isn't the...
I do think those are both more fair in a lower power environment (heck, I run both myself), though it depends on how much +1/+1 counter interaction you have. If you run counter doublers like Winding Constrictor or big fast mana like Gaea's Cradle and Sol Ring they become a lot scarier. I don't...
Easy Burning-Tree Vandal, it can get a sneaky attack in thanks through haste, and exerting for card filtering seems silly. The real question is, how does the Vandal stack up against Reckless Racer? Because I tested that card, and it kinda sucked.
Couple of interesting cards left.
Not sure that these are impactful enough, but the Goblin looks good with equipment. Very nice Raging Goblin variant. Undercity Scavenger puts a pretty big body on the board, that might just be good enough in combination with the scry 2. I have less faith...
https://magic.wizards.com/en/articles/archive/card-image-gallery/ravnica-allegiance-2018-12-17
Also, just the new cards at the top here: https://mythicspoiler.com/newspoilers.html
I guess it's all in the eye of the beholder, I loved the heck out of Kaladesh, Amonkhet, and even Ixalan for my cube, and then they released the crown jewel Dominaria! :)
This one ain't for my cube (wrong colors), but it seems beyond great in an aggressive BR deck!
Fireblade Artist {b}{r}
Creature - Human Shaman
Haste
At the beginning of your upkeep, you may sacrifice a creature. If you do, ~ deals 2 damage to target opponent or planeswalker.
2/2
Oh shit! This is super nice! Instant replacement for Artifact Mutation!
Cindervines {r}{g}
Enchantment
Whenever an opponent casts a noncreature spell, Cindervines deals 1 damage to them.
{1}, Sacrifice Cindervines: Destroy target artifact or enchantment. Cindervines deals 2 damage to that...
Yesss!
That's such a great set of abilities. I'm still cubing the original, but this might be worth testing. It's funny how both abilities roughly match. The red ability on both gives you some reach, and the green ability gives you some beef to work with.
Edit: Beaten to it by an inch!