MTG Salvation

If you're looking to get into commander on a budget, and want a deck that gives you a taste of the more impressive interactions of enter the battlefield effects, then you can easily spend $100 to play Yarok, the Desecrated and get a competitive experience.
Sure the land base doesn't pack the duel lands that some will have, but because you have excellent mana fixers, you will never feel too far away from casting all your spells.

The animals came in two-by-two
The deck contains some of the best cards in Magic to gain you advantages with enter the battlefield effects. Whether this is card draw, removal, land ramp or just other interesting effects that gain resources over opponents.

Enchantress without the Enchantresses
We have a bunch of enchantments that give us draw. Cards that normally allow you to draw one card for example, which is usually more like a replacement effect, will get triggered twice, allowing you to draw additional cards.
These type of effects really get you through your library in an efficient manner, getting you cards that are good for that stage of the game.
Oath of Jace allows you to basically draw 6 cards and discard 2.
Cards that are usually innocuous like Disinformation Campaign, are actually quite a tempo swing with Yarok, the Desecrated as you draw 2 cards and each opponent discards 2. That's an 8 card swing in a 4 player game.
Similarly something like Trial of Knowledge drawing 3 cards becomes drawing 6 cards and discarding 2.
There is even a Cartouche of Knowledge (drawing 2) to return the Trial of Knowledge. Ordinarily these cards wouldn't be worth the mana investments at sorcery speed, but with Yarok, the Desecrated they really are amazing value.
Duplicity with two trigger will allow you to draw 10 cards in your upkeep.

Most of the "Enchantress" draw in Magic are abilities that happen on cast triggers, so we wouldn't benefit with Yarok, the Desecrated ability. However Eidolon of Blossoms does in fact double up on enchantments entering the battlefield.

Some other interesting uses for doubling up of ETB triggers with enchantments are;
Dual Nature also puts two additional versions of the creature onto the battlefield.
Guardian Project allows you to draw 2 cards every time a creature enters the battlefield.
Path of Discovery allows every creature in your deck to have an inbuilt Jadelight Ranger, exploring twice.

Wild Pair allows for plethora of options as you are able to search up two creatures within the stipulations.
Power+Toughness=
2: Coiling Oracle, Risen Reef, Farhaven Elf, Wood Elves, Brain Maggot, Mesmeric Fiend, Bone Shredder, Cloud of Faeries, Elvish Rejuvenator, Springbloom Druid
3: Yavimaya Dryad, Reclamation Sage, Disciple of Bolas, Azusa, Lost but Seeking.
4: Solemn Simulacrum, Venser, Shaper Savant, Mulldrifter, Sower of Temptation, Ravenous Chupacabra, Acidic Slime, Wall of Blossoms.
5: Grim Haruspex, Beast Whisperer, Gonti, Lord of Luxury, Phyrexian Delver
6: Tatyova, Benthic Druid.
7: Caustic Crawler, Temur Sabertooth
8:
9: Greenwarden of Murasa, Sepulchral Primordial.
10: Avenger of Zendikar, Deadeye Navigator.
11: Woodland Bellower.
12: Rune-Scarred Demon, Rampaging Baloths, Soul of the Harvest, Sire of Stagnation.
18: Terastodon