Dont even bother attaching them to Eivor if you dont want to
Take a look: Adventure cards can go on their adventure to exile then enter the battlefield when you cast them from exile
You can also use flicker or bounce effects like from Legion's Initiative, which is in red, allowing you to trigger an additional four damage while giving it haste to trigger another four in combat with just two mana
A good example, especially in this color identity is Bloodghast, who comes back every time you play a land
There's four of these in the set: Clive, Jill, Joshua, and Dion
This terrific Elf lord also features a repeatable activated ability that allows you regenerate another Elf for the paltry sum of , which can negate any targeted removal or board wipes aimed at your most important Elves