While you do have to tribute summon these guys to get them on the field, you can use field-spell cards like Mausoleum of the Emperor to get them on the field insanely quickly or monsters such as Double Coston to make tribute summoning them a breeze
I find it best to let this art and the cards speak for themselves, so lets move forward to some details
Once cast, the controller searches their library for a creature with a mana value of X or less, which then enters the battlefield
Rocks and small tree stumps had been strategically placed, by the Dungeon Master onto his new Kraken Dice Quick Mat, to ensure that his adventurers would have the opportunity to make full use of their myriad of skills
It's one cheaper, rarely stays around unless you want to spend 10 total mana, and then rocks flying and pro Black to block safely for the turn and is just one color