Since in many cases the opponent who endangers one player is a threat to the whole table, and you are not making any rapid move to end the game yourself, you end up as a benign defender of the status quo especially if someone else has a good start on a more proactive deck
On top of that, there are also a handful of creatures that have lifelink outright: If you are in need of life, Heliods Intervention is an X spell can gain you life equal to twice the amount of X
Given the size of the threats and the ability to amass a very wide board, this is an Aggro deck that can hang with Midrange once those decks start being able to deploy their larger spells
Seedborn Muse is a five-mana 2/4 that allows you to untap all permanents you control during each other players untap step
Cavern-Hoard Dragon does a reasonable impression
My Overall Verdict Zombie tribal remains one of the most rewarding Commander archetypes because it balances resilience, pressure, and long-game inevitability