With a mana value of 3, which triggers Yshtolas damage ping to opponents and healing for you, this Enchantment-Aura card has Flash, meaning it can be played with the speed of an Instant
Glarb, Calamitys Augur Glarb, Calamity's Augur is slowly climbing the ranks of popular Sultai commanders, not because its going to give Muldrotha, the Gravetide a run for its money in casual Commander any time soon, but because the surveil 2 on tap helps to stack the graveyard for a pile of cEDH wincons in the Sultai colors
This can be either through silver bordered cards that simply make the whole ordeal an absurd joke or by working around the limits of black bordered cards in original and imaginative ways
The only other Standard rare worth more than $10 is Ranger Class
Be sure to protect your own enchantments and prepare countermeasures, since your opponents will definitely be running some of the best enchantments MTG has for their decks.