One of the vital concerns during a duel is getting enough of the right type of land into play to generate the mana you need to cast your spells
So here is the first tip already: always look up the set number on Bulbapedia (or similar websites) to check if its indeed an existing card
For each mulligan a player takes, their opponent can choose to draw a card
#14 UPDATE 10/03/2023: ADDED Venusaur (Special Deck Set ex Venusaur & Charizard & Blastoise, Scarlet & Violet 151) , Charizard (Special Deck Set ex Venusaur & Charizard & Blastoise, Scarlet & Violet 151) , Blastoise (Special Deck Set ex Venusaur & Charizard & Blastoise, Scarlet & Violet 151) , IR Bulbasaur (Special Deck Set ex Venusaur & Charizard & Blastoise) and IR Squirtle (Special Deck Set ex Venusaur & Charizard & Blastoise) to the list of Internationally-Unreleased cards
Sacrifice five Treasures to search your library for an artifact or Dragon card and put it onto the battlefield
Enlightened Tutor quietly turns artifact and enchantment decks from hope I draw it into Ill just go get it. Ive cast this at the end step before my turn to line up a Smothering Tithe , a Rhystic Study , or a key artifact my deck revolves around