There werent a ton of creatures yet, so you filled your deck with what you had
Think about it
Land Color tag templates(None) Badlands Land - Swamp Mountain Color tag templates(None) Bayou Land - Swamp Forest Color tag templates(None) Bloodstained Mire , Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle
No matter what else changes about Magic , there will always be ways to profit from permanents dying, and advantages to making sure they die on your terms
Dracosaur has the classic Baneslayer issue of needing to survive a turn before doing anything interesting, though its ridiculously hard to tussle with in combat
Merrow is untapped as a cost from that ability, so repeat step 3 and 4 until you have no deck