It was stupid good when it was released, and that was despite being in the same set as Yawgmoths Bargain
This lets you keep the pressure on turn after turn, where most reanimation effects are one-and-done affairs
Howling Mine is the grandparent of them all, having seen the light of decks back in Alpha , and it does have an interesting catch that not all later iterations have: You can turn the hugs on and off, as long as you have ways to tap or untap the artifact as needed
The issue with this is that a lot of dorks in RDW already have haste and a bunch of those that don't come out before this
The next expansion will continue to trend of releasing new Mega Evolution Pokemon EX cards, and a trailer that has been released alongside the announcement shows that Grass-type Teal Mask Ogerpon EX, Psychic-type Mega Gardevoir EX, and Steel-type Mega Mawile EX will be among the cards included in the upcoming expansion