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
Think about it
There are no requirements for the effect, letting you get any of your best Rats out from your library and into your hand at your upkeep
Merrow is untapped as a cost from that ability, so repeat step 3 and 4 until you have no deck