Once in play, Smile at Death lets you bring back two creature cards with power two or less from your graveyard back to the battlefield, adding a +1/+1 counter on both those creatures
It's a bit broader (being able to work on defense), a bit more combo-able (triggering ETB watchers), but more manual (requiring mana to use)
Here is an old, but excellent, article that is very easy to use in Commander
We get going and I say, wait, you can't do that
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Naturally, both doors can be individually unlocked by paying the specified mana cost