Graded Population Report: Machamp [1st Edition] #8 Visualize the distrbution of grades in the chart
Glivedive Duo is a good example: a Bat/Lizard whose enters the battlefield ability also makes it effective in the different animal archetypes (as well see below)
To be clear: This is a far, far worse Giant Growth than Giant Growth
Guild Artisan is also a good option for B/R because of its treasure generation
For decks with three or more colors, where you might only be able to afford a small number of MDFCs since you'll need most of your lands to either be basics (for ramping / tutoring purposes) or tap for multiple colors of mana, the best MDFCs are Bala Ged Recovery (seriously, if you have green mana in your deck, play this card), Valakut Awakening, Hagra Mauling, and Ondu Inversion, along with the mythic cycle, which is almost always good if you can afford another land that only taps for a single color of mana