You should be able to reach the required 21 commander damage easily, usually after one or two attacks
Something like infect for example is just able to distribute so many poison counters
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And maybe you could do something crazy with Food Chain
Estrid isnt the worst, but I think you can do better in terms of planeswalker commanders
So, at the end of the day, whether you're suiting up a Pinger with a Basilisk Collar, burying the table in value with Shanna, or slamming a rule-zeroed Griselbrand to combo off, it goes without saying that Lifelink remains as one of the most entertaining ways to take over a game