Snow: an identifying characteristic of permanents and spells, closely tied to snow activation costs and mana costs
Dugtrio's attack, called "Dig", also only needs one energy, allowing players to get this card into action quickly and start causing problems
I dont like the life loss on either though there really isnt enough room to be losing life every turn, and there arent enough aggro decks that want Ancient Tomb and can finish a game fast enough to not be punished by it
There are a lot of situations where this could be a powerful ability, but let me give you a simple example
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Here is the official link for Collecting March of the Machine: Thats got all the information we need for most of this