Vigilance
Whenever another creature you control enters, Leaf-Leap Guide and that creature perpetually get +1/+1.
, : Return another target creature you control to its owner's hand.

Whenever Recruit Instructor attacks, draft a card from Recruit Instructor's spellbook.
Valiant — Whenever Recruit Instructor becomes the target of a spell or ability you control for the first time each turn, create a 1/1 white Mouse creature token.

When Euru, Acorn Scrounger enters, you may forage. When you do, conjure a card named Chitterspitter onto the battlefield.
Whenever one or more Squirrels you control deal combat damage to a player, you may sacrifice a token. If you do, put an acorn counter on each permanent you control named Chitterspitter.

Convoke
At the beginning of your end step, if you control a tapped creature, seek a nonland permanent card with mana value X or less, where X is the number of tapped creatures you control. Put that card onto the battlefield.

When Indris, the Hydrostatic Surge enters, conjure four cards named Lightning Bolt into your library. They perpetually gain storm. Then shuffle.
Whenever you cast an instant or sorcery spell, draw a card.