It costs two mana at base to bounce a nonland permanent
As far as Dredgevine itself, the most important piece of the deck is Vengevine, which much like Bloodghast is a creature that can return from the graveyard for free
Vintage Stock is a great place to go for cheap cards to help round out your deck
Jagged-Scar Archers Some elven archers are known for their prowess in killing flying creatures, and Jagged-Scar Archers is the perfect addition to any elvish typal deck, as you get to deal damage just by simply tapping the card
Champions of Kamigawa Kiki-Jiki, Mirror Breaker Kiki-Jiki, Mirror Breaker was the first card to create a temporary creature token that is a copy of something
Every enchantment you play gives a creature of your choice a +1/+1 counter, which also triggers when Calix comes into play