The Reserved List Ben Guilfoyle surveys Magics Reserved List as a Commander toolbox beyond the usual headlines, spotlighting underplayed legends, versatile utility lands, early color-pie outliers, quirky build-arounds, and potent engines
Whenever another permanent you control is put into a graveyard from the battlefield, if it had one or more counters on it, you may put that number of +1/+1 counters on target creature
None of that when it enters the battlefield/attacks/deals combat damage nonsense
For now though, it seems like all four are worth checking out
Its still in the affordable range for Mirran swords that can slot into any Voltron or aggro deck
However, Mana Vault does not normally untap unless its controller pays four mana during their upkeep, taking one damage if this card is tapped