These last two days, I'm quite (un)lucky to get Earth Quests for 2 days in a row. I like using Magic Deck, because it can penetrate shields. But my preference is Water Magic Deck, because it got Alric (+1 Magic), Oshannus/Torhilo (Void), Wavesmith (Protect) and Coral Wraith (Sneak).
Most people nowadays are using Obsidian, and for some reason, most of the time I always lose in Obsidian vs Obsidian battles. So, from research and others suggestions, I decided to rent Mushroom Seer
As you can see from the stats, it has 2 Magic and 3 Health, but the most important is it has Silence which reduces magic attack of all monsters by 1. More or less like Bortus.
For the tank I sometimes use Mycelic Slipshawn (Taunt) or Unicorn Mustang (Void)
Then i use two healer if possible : Goblin Psychic and Wood Nymph. If one of them if the mana is not enough.
Below I'm sharing some of my Obsidian VS Obsidian :
https://splinterlands.com?p=battle&id=sl_1c1448d8a13e18f8db47b6878f62ca60&ref=renora
On this battle, because of Mushroom Seer and double healer, my Mustang last longer than his.
https://splinterlands.com?p=battle&id=sl_8408874c479b4f5779938ebe564be205&ref=renora
On this battle, both of us are using 1 healer, but because of Mushroom Seer, my Mustang also last longer than his. And because of Super Sneak, I use Regal Peryton at the back.
https://splinterlands.com?p=battle&id=sl_f7519d3ec6f00e6247417c5b904ea9cb&ref=renora
Because of Melee Mayhem, I thought my opponent will use melee monsters so I use Mycelic Infantry (which I regret) but I still win because of Mushroom Seer and double healer.
https://splinterlands.com?p=battle&id=sl_c98b23d09a495e6454af32555f4bd87b&ref=renora
Although for this battle I can't use healer, Mushroom Seer reduces their attack so my Slipspawn last longer.
In conclusion, it's not 100% win guaranteed, but I finished two of my Earth Quest thanks to Mushroom Seer.
If you haven't play Splinterlands yet, consider using my referral : https://splinterlands.com?ref=renora
Have a nice day and Merry Christmas