whenever you gain life cards mtg What counts as "gaining life" : r/mtg Exemplar of Light · Foundations

And these sleeves deliver

The Red and Green ones aren't that different from other cards that exist today, but they both add a little zest to your deck as well

If a creature with an ability that triggers when that creature dies or leaves the battlefield loses that ability and is then destroyed, that ability will not trigger

WotC tends to stay far away from these kinds of changes but did it pretty often back in the early days of Magic, mainly in the jump to Sixth Edition where a lot of cards were simplified

Of note, the 13 new rares from Eldrazi Incursion show up with the same art and treatment as you will find in their Commander deck due to Eldrazi already having a colorless transparent frame

How good Triomes are depends on the format and the type of deck that you play