User blog comment:Poisonshark/Custom Champion — Nicol Bolas, the Elder Dragon/@comment-7709681-20180402211605/@comment-25235491-20180403180517

Actually, I looked into MtG lore and nowhere does it say that Bolas killed the other Elder Dragons. The only references to the other Elder Dragons is pre-revisionist lore, which far predates the idea of the Mending itself (not Merging) — even though he's still way overpowered post-Mending (mostly because he absorbed a ton of power from the Conflux way back on Alara). The only thing he's known to have said once is that no survivor of the Elder Dragon Wars with the exception of himself still existed, but he could as well have been lying.

Also, about effort, see the meta jokes below, and know that I literally made that in 15 minutes.