It's a great callback to the original Elder Dragon cycle (e.g
Legendary Creature - Human Pirate Ramp (CTRL to add secondary) Recursion Rakshasa Debaser Whenever this creature attacks, put target creature card from defending player's graveyard onto the battlefield under your control
The only real times I would want to splash other non-red colours is when I didn't get enough playables in green and needed to make up numbers
Lots of these cards have special art but the normal frame, or maybe a retro frame, or perhaps a special foiling over a normal frame
On the new-card side, Shard of the Nightbringer is the one people want, an 8/8 flyer that drains half a players life when it lands, with Biotransference and Their Name Is Death rounding out the flavor-meets-function picks
For five mana you get a decently-sized threat that also can draw you some cards