Masticore [From the Vault: Relics]Set: From the Vault: Relics Type: Artifact Creature Masticore Rarity: Mythic Cost: {4} At the beginning of your upkeep, sacrifice Masticore unless you discard a card. {2}: Masticore deals 1 damage to target creature. {2}: Regenerate Masticore.

all for one

We must understand it

Pay 7 life: Destroy target nonland permanent

−3: Put target nonland permanent into its owner's library third from the top

Set: Kaladesh Prerelease Promos Type: Artifact Rarity: Rare Cost: {4} Whenever you cast a spell

Set: Legends Type: Enchantment Rarity: Uncommon Cost: {W} At the beginning of your upkeep

Set: Alpha Edition Type: Artifact Rarity: Rare Cost: {4} All Swamps are 1/1 black creatures that are still lands

then discard three cards at random

Set: Starter 1999 Type: Sorcery Rarity: Rare Cost: {U}{U} Until end of turn

Tezzeret Type: Legendary Planeswalker — Tezzeret Rarity: Mythic Cost: {3}{U}{U} +1: Untap up to two target artifacts

Set: Legends Type: Creature — Insect Rarity: Rare Cost: {1}{G}{G} Flying

Set: Judgment Type: Instant Rarity: Rare Cost: {2}{U} You may choose an instant card you own from outside the game