Very much like the Jitte you never want to be using this to gain life (unless you are doing some silly infinite combo with Fastbond and Crucible of Worlds)
For example, if Doctor Doom is dealt 1 damage by a creature with deathtouch while he has indestructible, he won't die if he loses indestructible later in the turn
Generally, prices for the Undefeatable Red GX Gold Card can range from a few dollars to several hundred, depending on these factors
While theres no universal rule, most Commander decks should aim for around 38 or 39 lands, complemented by roughly 8 mana rocks, ramp spells, or mana-producing creatures (such as Sol Ring, Arcane Signet, Rampant Growth, or Birds of Paradise)
Life is good
There's an entire Raccoon deck in Bloomburrow just waiting to be broken with the help of Gourmand's Talent