neon kamigawa set booster box Magic: The Gathering Dynasty – PokePower plus at least one foil card and at least one Rare or Mythic Rare Kamigawa Neon Dynasty set booster

There are two cards that allow you to lock an unlocked door: Marina Vendrell and Keys to the House

Magic: The Gathering - Official Encyclopedia, Volume 2: The Complete Card Guide

To do this, you need your Energy cards

The Most Expensive Energy Pokemon Cards 1

Other ways to force a round of Solar triggers include creatures like Hostage Taker which can cause additional ETBs as they enter and leave the battlefield, or creatures which have an ability to enter the battlefield for zero mana, such as Solitude

Card Text 2 [Special Rule] Overflow (-3) (As this card moves from the battle area or under a card to another area, lose 3 memory.) BT15-014 SR Digimon Lv [Counter] Blast Digivolve (One of your Digimon may digivolve into this card without paying the cost.) [On Play] [When Digivolving] You may play 1 play cost 4 or lower red Tamer card from your hand without paying the cost