Like most Magic: The Gathering cards, the value of Mother Kangaroo depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Unsanctioned)
The reason is that you have to play at least one way to handle a problematic land, but you only absolutely need the one thanks to Crucible of Worlds
And you could do worse than Maelstrom Colossus in your Averna, the Chaos Bloom or Imoti, Celebrant of Bounty decks
Intruder Alarm was reprinted in the Wilds of Eldraine: Enchanting Tales and combines with as few as one other card to provide infinite creatures
Of the 29 instant and sorcery spells in this deck , many are direct damage spells, some of which have a huge base cost that is possible to reduce