Oh well I can’t do anything cuz I don’t have those 3 cards. I am tired of getting my butt kicked left and right. Guess I only have one option and that’s to quit unless anyone else has beaten this without having every damn mythic in the game. Just very frustrating. Help please!
You don’t need specific cards to beat that level, nor do you specifically need Mythics.
What you need is a strategy. The opponent starts with 342 life. You won’t be able to outrace them. You need to control the board.
Also, the opponent destroys gems of your color. So, it’s not a good idea to put any supports in play which turn gems to your primary color. Supports you do put into play should pump your creatures and cause them to bash into your opponent’s creatures. Hedron Blade is useful if you have it, because almost all of their creatures are colorless, and you can give your creature deathtouch and berserker (meaning that your creature will kill theirs even if yours is a 1/1 and theirs is a 24/24).
If you only have the original walkers, I would recommend:
Gideon: put every “destroy target creature” effect into play as you can (Smite the Monstrous, Scour from Existence). Try to get either first strike or lifelink creatures, and try to pump them up as large as possible. If two creatures are going to collide, try to put protection on yours like Enshrouding Mist. Recommended (non mythic) cards: Brawler’s Plate, Hedron Blade, Iroas’ Champion, Knight of the White Orchid, Knightly Valor, Sandstone Bridge, Scour from Existence, Sigil of Valor, Smite the Monstrous, War Oracle, Serene Steward, Alchemist’s Vial, Chitinous Cloak, Kor Entanglers, Consul’s Lieutenant, Ulamog’s Despoiler (wait until there are void gems on the field before casting).
Liliana: put every “destroy target creature” effect into play as you can. Put any card into your deck that can force them to discard their first card (Transgress the Mind is best if you have it). Use her 1st ability to force discard of the opponent’s cards, but wait until they’ve put some mana into that card. The opponent’s cards have very high casting costs and you can take advantage of this.
If you are using Liliana’s 1st ability, any creatures in your hand which you discard count as having “died” for effects that bring creatures back. So one trick Liliana players use is to use her first ability to put large creatures in her graveyard and her 3rd ability to bring 3 of those creatures back to life.
Nissa: use Scour from Existence to destroy creatures, use creatures which can get bigger over the course of the game (Managorger Hydra with a bunch of spells, Sylvan Messenger as the only elf in your deck - when you cast her, she will put another Sylvan Messenger in your hand). Use effects which give your creatures berserker or reach, or make them really big before contact, such as Nissa’s 2nd ability. Also, with Nissa, if your strategy revolves around certain creatures, put some creature tutors (Seek the Wilds, Gather the Pack) in your deck so you can access those creatures more frequently.