Hearthpwn

My second, more successful attempt at a deck including the Expired Merchant + Cruel Dinomancer combo.

This is an attrition based deck, that plans to win through Cruel Dinomancer resummoning themselves, rendering them essentially unkillable. Spiritsinger Umbra can help create a board of more than 30 power, thus giving us an advantage against popular stall decks using multiple reanimation tools.

Be wary of Highlander lists, as Zephrys the Great can offer them an out through Mass Dispel. You can have up to 4 Dinomancers during the game, so you can bait it out before playing Umbra.

As for mulligans, hard mulligan for the Expired Merchant and the Cruel Dinomancer. The deck's build is such that the rest of the cards are mostly interchangeable, but you need to draw those two not only for your win condition, but also so the Highlander cards become active.