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Game crashed because of a failed assertion during untap phase with Leaf-Crowned Elder on the field. Screenshot and dump.txt attached.

Edit: I assume having known the top card of my deck would have been useful, however I can only provide the deck content hoping it's relevant:

.11367 2 Spikeshot Elder
.1223 2 Eternal Witness
.1469 2 Sakura-Tribe Elder
.1611 2 Viridian Shaman
.1320 4 Vulshok Sorcerer
.1679 1 Storm Shaman
.1254 2 Incinerate
.145 4 Lightning Bolt
.241 4 Taiga
.740 1 Pendelhaven
.91 5 Forest
.164 6 Mountain
.2292 1 Gorilla Shaman
.9726 2 Woodfall Primus
.10626 2 Oracle of Mul Daya
.10444 2 Master of the Wild Hunt
.10755 2 Dragonmaster Outcast
.6820 2 Troll Ascetic
.11118 1 Elixir of Immortality
.3897 1 Shivan Gorge
.665 1 Hammerheim
.11843 2 Skinshifter
.9328 4 Bosk Banneret
.9377 4 Leaf-Crowned Elder
.10629 2 Oran-Rief, the Vastwood

Confirmed in release.