Both Bobbleheads , the Overflowing Chalice , and Thought Vessel are solid cards, but there are better mana rocks available, especially in the three-mana range
Well, you'll either need to collect the cards from Arena booster packs for the sets they came in, or else directly 'craft' the specific cards you need using MTG Arena Wildcards - effectively tokens you can exchange for the exact Common, Uncommon, Rare, or Mythic Rare card you want, depending on the type of Wildcard
Advanced Search Sets Random Syntax Showing 1-4 of 4 cards: "rules text: Creatures your opponents control attack each" Display: Card Small Sorted By: Card Name Ascending Showing 1-4 of 4 cards: "rules text: Creatures your opponents control attack each" Angler Turtle Fumiko the Lowblood Kardur, Doomscourge The Akroan War Advanced Search English
Heck, all the more so
You can't add more than 100 damage in this way