At worst, this is a 5 mana, draw multiple cards spell, essentially, assuming you immediately kill it for its -3 ability
Success hinges entirely on Yidris dealing combat damage, making cards that grant evasion like Aqueous Form or protection like Whispersilk Cloak absolutely essential
Eldrazi strategies can be a bit braindead, and thats true here
The smorgasbord of Savannah Lions available today gets much more attention, particularly Usher of the Fallen, but I find the gameplay of Legions Landing much more compelling
Wizards of the Coast gave it earthbend 1 when it enters, meaning you get the 2/2 creature and you can animate a land and put a +1/+1 counter on the land
Did any of these D&D-themed precons catch your attention over the others