Sword of the Animist and Land Tax both help you to get more land into play, but more importantly, they help thin your deck so that you can find more important cards to advance your strategy
The legendary Sram has one ability, but it's so good
Crop Rotation, Elvish Reclaimer, and Knight of the Reliquary all help find your lands reliably, and the addition of Minsc & Boo, Timeless Heroes provides a secondary win condition
Windborn Muse For just 1 additional mana, this Windborn Muse is a Ghostly Prison with wings
Trample, haste, annihilator 1 (Whenever this creature attacks, defending player sacrifices a permanent.) Hideous Taskmaster's second ability will resolve before Hideous Taskmaster does