Halana and Alena, PartnersHalana and Alena, Partners does an excellent job of adding +1/+1 counters and haste to other creatures turn after turn
Don't make the mistake of waiting to get the counter set up to cast it, it's already good
If I recall correctly, this began in the core set with Garruk, Primal Hunter with a rough five-cost with triple Green, but then +1 to make a 3/3 Beast that's Green or -3 once to draw
What is important here is not the absolute value, that can be influenced by several factors (humidity, characteristics of the scale, etc) but the fact that 2 cards of the same set should have the same weight
Grimoire Reddit translations show us that the Grimoire drop includes the following cards: Heroic Intervention always hovers over $10 no matter how many reprints it gets, and Commander powerhouse Cyclonic Rift pushes around $30-40 depending on the copy, so safe to say this drop is worth the money, assuming it's sold at a typical Secret Lair price point