Pretty low on this in comparison to the others, there's a lot of good options in this slot. Also, I consider Earthshaker Khenra to be one of the better 2-cmc red creatures, only below Young Pyromancer and Kari Zev, IMO.
As a general statement about the card, and not it's playablity in cube, I really don't like that the 2 abilities don't work with each other. You should be able to pay 3RRR to make a 5/5 with haste
While the late game scaling is nice, this is below Earthshaker Khenra / Robber of the Rich / Bloodthirsty Adversary in my book since they already come with haste and also have abilities that scale well later in the game.
1R
Legendary Creature - Goblin Samurai
R: Creatures you control gain haste until the end of turn.
3RR: Create a 5/5 red Dragon Spirit creature token with flying. Activate only if you control an attacking modified creature.
2/2
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These last editions brought a lot 2cc red creatures. Nowadays How do you rate this compared with low tier in large cubes, such as Kargan Intimidator, Heartfire Immolator or Earthshaker Khenra?
My High Octane Unpowered Cube on CubeCobra
[180 classic cube]
My High Octane Unpowered Cube on CubeCobra