Another possibility is the transformational plan
Many Allies have triggered abilities (especially ones with the rally ability), allowing them to double up on the triggers so long as Katara is on the battlefield
Whether you love it or hate it, theres no denying Conjure is a big can of worms to open, especially at a time when mainline sets are already getting more complex
It provides the ability to grind out when you run out of cards, almost giving you an extra card draw each turn, but better, as it's a permanent of your choice from your graveyard, nulling any efforts by your opponent when using removal spells
Here's an example of the math: The team has 19 life, so the player has 19 life
Longtime MTG players may bristle at the non-fantasy Wild West theme