ironhoof boar mtg card text Return that creature to your hand at the beginning of the next end step Ironhoof Boar MTG - Kamigawa:

Enhancing the speed at which you find these big dinos is Pantlaza, Sun-Favored , who can discover your way to bigger and badder dinos the more dinosaurs you play

This means some unconventional cards are up for consideration

City of Brass makes you take one damage when it is tapped and can give you one mana of any color in return and, likewise, Mana Confluence adds one mana of any color but has the requirement of paying one life

Modern tutors cost more, add restrictions, or make you wait a turn

Exile this artifact

Eshki is a bit more of a generic big creature commander, not having any specific Dragon abilities, but giving you a free draw when you cast a creature with power four or more, and then dealing damage equal to Eshkis power when you cast a creature with power six or more