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)
Intruder Alarm was reprinted in the Wilds of Eldraine: Enchanting Tales and combines with as few as one other card to provide infinite creatures
I also play decks that tend to go long, so these end up untapped for a significant portion of the game
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
The good news here is that every one of your Beasts which survives the fight will be around to battle later
This makes Helga an ideal choice for any creature-loaded Commander deck in Bant colors (green, white, and blue)