Obviously, it depends on your deck, but I believe players should look for reasons to play more lands, not fewer
Its not always easy to measure how effective is the card draw is, but most deckbuilders count as card draw only cards that net 2+ cards in hand
In a singleton format you have to run a set of cards that all fulfill the same basic function, so instead of running 4 copies of Harmonize, you might run Harmonize, Greater Good, Beast Whisperer, Return of the Wildspeaker, Garruk, Primal Hunter, Shamanic Revelation, Soul's Majesty and Rishkar's Expertise
After one or two explore triggers, Francisco starts triggering itself, which is even better
Rayquaza VMAX cards with the same ability and attack can be found for around $5 if youre not looking for a card that features this exact artwork
Almost all of them tap for mana, but some have additional abilities or can create multiple colors of mana