"Do this only once each turn" refers to putting +1/+1 counters on your creatures using the triggered ability. As long as you haven't yet chosen to put +1/+1 counters on your creatures with it, all instances of gaining life will cause Nykthos Paragon's ability to trigger.
Once you have chosen to put +1/+1 counters on your creatures, further instances of gaining life will not cause the ability to trigger.
If multiple instances of the ability are on the stack, you will be able to put +1/+1 counters for only one of those instances. Once you do that, other instances will do nothing as they resolve.
Last observed on Scryfall 2 months ago at $0.72. Over the trailing 90 days the price moved between $0.50 and $0.83 across 92 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 2 catalogued treatments from MH2 — the lineup includes Showcase alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #331 of *Modern Horizons 2*, the set that shipped alongside the June 2021 Modern Horizons 2 release.
Card type: Enchantment Creature — Human Soldier, color identity white, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {4}{W}{W} (6 converted).
Legal across the major constructed formats — Modern, Legacy, Vintage, and Commander — plus Standard rotation play.
EDHrec ranks this card #3,070 in Commander, putting it in the niche-pick tier of the format's playable pool.
Illustrated by Martina Pilcerova. Rarix catalogs 404 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Martina Pilcerova
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
If a creature you control is dealt lethal damage at the same time that you gain life, it won't receive +1/+1 counters from Nykthos Paragon's ability in time to save it.
Each creature with lifelink dealing combat damage causes a separate life-gaining event. For example, if two creatures you control with lifelink deal combat damage at the same time and you haven't used it yet, Nykthos Paragon's ability will trigger twice. However, if a single creature you control with lifelink deals combat damage to multiple creatures, players, and/or planeswalkers at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will trigger only once.
"Do this only once each turn" refers only to the ability it is attached to, not other instances of the same ability. In other words, if you control multiple Nykthos Paragons, you will be able to do this once for each of them.
