I've still never opened a Splinterlands pack, so let me think back to my MTG days...

I started playing that in 4th Edition, so no opportunities to pull a Lotus, Mox, dual land. etc. It was probably something like Necropotence from Ice Age. That was a card that I knew from magazines was dominating tournaments, but one hat I had no clue how to use as a casual player. Still exciting to pull in the moment, even if I never really played it.