By equipping Helm of the Host to Restoration Angel, you set off a cascading loop each combat step that generates an unbounded army. As the token copy of Restoration Angel enters, its triggered ability blinks a non-Angel creature whose base power is 4 or greater, which in turn satisfies the condition of Life Finds a Way. Because Life Finds a Way triggers off this heavy-hitting entrance to populate, it creates a fresh copy of the Restoration Angel token, immediately restarting the blink chain and flooding your board with endless Angels, infinite enters-the-battlefield triggers, and a spiraling army of tokens ready to overwhelm the table.