Sacrifice Lena: Creatures you control with power less than Lena's power gain indestructible until end of turn
Commanders such as Kenrith, the Returned King and Kinnan, Bonder Prodigy can quickly spiral out of control, so having an answer for them that doesn't stop your own activated abilities is fantastic
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Some of these will recharge or can be earned for free, others can't, and there's one currency - the Advance Ticket - that doesn't do anything at all right now
However, the life gain this deck leans on also keeps it alive after it drops this, and even a simple Congregate can be enough to get you over your needed life, especially if twinned with other life gain cards like Rhox Faithmender