Rares usually carry the most impactful abilities and make up the bulk of high-value singles on the secondary market
If Phyrexian Fleshgorger is no longer on the battlefield at the time the ward ability resolves, use the power it had the last time it was on the battlefield to determine how much life that player must pay (though if Phyrexian Fleshgorger was the only target, the spell has no legal targets anymore and hence it would not resolve even if they pay the life)
We are forced to do this to the player on our Right but other players usually have good cards because they're trying to win and we will always be giving away something that hurts the player on our Left, or the entire table
As with Inti, this provides a nasty double whammy of pressure and card advantage
Not only can these be used in Pokemon TCG, but they are also purposed for Dungeons and Dragons, Shadowrun, Pathfinder, Savage World, Warhammer, and more