One of the longstanding tricks in the format is to play Karmic Guide alongside Saffi Erikdottir so that you can put the echo trigger on the stack and then sacrifice Saffi, eventually bringing back Karmic Guide (since, in your Karador deck, Saffi is cheaper to cast)
Theres a reason many of us still cant get Your move! to the tune of the Yu-Gi-Oh
Outside of the cards pricey enough to be officially graded and sealed inside a fancy case by the likes of PSA, looking for less top-dollar cards (look, Im not Post Malone) comes with the constant risk of stumping up the cash for something that either doesnt arrive at all, arrives in a condition different to what you were expecting or turns out to be a complete fake
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However, if a single creature 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