mtg progenitus commander deck Pro 100+ Box Exile Relic of Progenitus Progenitus Combo (Competitive) - EDH

You really have to figure out a way to pick a fight with something that won't outright kill Garruk in order to get him to transform, but that's not always possible

That said, there are a few possibilities that can allow you to finish your deck without breaking the bank

The Squire is available in a range of colours too

Birthing Pod Birthing Pod is an incredibly powerful tutor that puts cards straight into play for the low cost of a single Phyrexian green mana, though nobody ever pays green for this card

Source: Zebra Partners

Clamp is not always suitable to play as you not only need the creature count but specifically the disposable creature count