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These are not merely reprints

Various websites are dedicated to selling Japanese Pokmon cards to collectors outside Japan

No matter what benefit you receive, the keyword triggers "if you gained life this turn." These two cards with the mechanic (I paired the image above with their mascot, as we only saw two cards with Infusion) show different ways you benefit from having gained life

Credit: Wizards of the Coast Zask, Skittering Swarmlord FromTheShire: Playing lands from your graveyard is a great effect, and there are a metric truckload of Insects these days, including some pretty good ones like Mazirek, Kraul Death Priest and Caustic Caterpillar that you're going to be real happy to cast over and over

How to find out for sure though

Evolution Witness allows you to return a permanent card from your graveyard to your hand whenever a +1/+1 counter is placed on it