Before the various Portal and Starter sets became legal, the biggest pushback against their inclusion in various formats was that two amazing cards would get added to games and warp metagames and such -the horsemanship ability, which was essentially unblockable, and Jungle Lion
Based on the latest market prices tracked on TCG Stacked, a foil copy of One Ring to Rule Them All is worth about $5.18 USD
Sets like Bloomburrow and Wilds of Eldraine also used it widely on their card lists, creating worlds and gimmicks where food is just as important as it can be in the daily life of human beings
A 4/4 creature for 5 is a reasonable rate as well, though as with most of blacks best mana doublers, being a creature is a pretty significant drawback with the amount of spot removal and board wipes flying around
III This Saga deals 5 damage to each opponent
Play Teferi, Temporal Pilgrim into The Temporal Anchor, and you'll have a steady means of drawing answers