To be sure, Nirkana Revenant will all but ensure that it will keep itself safe by doubling up on all your mana needs and giving you an outlet for all that extra mana
This works beautifully with cards like Frantic Search and Entomb to give you an engine to stock up resources before it flips into a graveyard powerhouse
If you have ways to protect Kyler, Sigardian Emissary, odds are you will be winning the game when it has a ton of counters on it
Otherwise, its controller may search their library for a basic land card, put it onto the battlefield tapped, then shuffle. In essence, this is a ramp spell that can also be used to destroy problematic artifacts or enchantments, and thats a really interesting bit of design, and well worth picking up for your decks
Since players like equipping Skullclamp to X/1 creatures, having "anthem" effects like Elvish Archdruid may actually create a non-bo, or a contradicting combo
Deathrite Shaman It turns out one of the best mana dorks in the game is also one of the best lifegain cards