Elden Beast

Flying, Annihilator 1, Trample, Hexproof
When Elden Beast enters and at the beginning of your upkeep, create a Minor Erd Tree token. Then if you control 10 Minor Erd Trees, sacrifice them and destroy all permanents you do not control.

When Elden Beast deals combat damage to a player, you become the Monarch and creatures you control gain protection from that player until the end of their next turn.

Other legendary creatures you control get +1/+1 for each Minor Erd Tree you control.