[HC01] Blasts from the Past

[Thomas★Zero]

Duel Tower Alcatraz
Field Spell Card
At the start of the Battle Phase: Activate this effect; each player can reveal 1 monster from their Deck, except a monster with ? ATK, and if they do, banish those monsters face-down. The player that revealed the monster with highest ATK can Special Summon 1 monster from their hand, and if they do, it can attack directly. Once per turn, during the End Phase: You can activate this effect; if this card is still on the field during the End Phase of your next turn, destroy all cards on the field.

Duel Academy
Field Spell Card
This card gains these effects based on the Types of monsters on the field.
● Warrior, Beast, Pyro: Once per turn, if you activate a Trap Card: You can target 1 card your opponent controls; destroy it.
● Dinosaur, Sea Serpent, Thunder: Once per turn, if you activate a Spell Card: You can inflict 1000 damage to your opponent.
● Machine, Fairy, Fiend: Once per turn, if you activate a monster effect: You can target 1 face-up monster you control; it gains 1000 ATK.

Ready! Set! Duel!
Continuous Spell Card
When this card resolves, if you control no other cards, you can add 1 “Synchron” monster from your Deck to your hand. Once per turn, during your Standby Phase: Place 1 Signal Counter on this card. You can remove 2 Signal Counters from your field and send this face-up card to the GY; draw 2 cards, then send 1 card from your hand to the GY. You can only activate 1 "Ready! Set! Duel!" per turn.

Overlay Network
Continuous Spell
During your Main Phase: You can activate 1 of these effects.
● Target 1 face-up monster you control that has a Level; Special Summon 1 monster with the same Level from your hand or GY in Defense Position (its effects are negated). You cannot Special Summon monsters from the Extra Deck during the turn you activate this effect, except Xyz Monsters.
● Target 1 Xyz Monster you control; add 1 card attached to it to that card’s owner’s hand.
You can only activate this effect of "Overlay Network" once per turn.

Battle Royal Mode – Joining
Continuous Spell Card
Activate this card by targeting 1 Effect Monster on the field. The first 2 times that target would be destroyed by battle each turn, it is not destroyed. When that target is destroyed by battle, the player that destroyed it gains 2000 LP. If the turn player’s opponent takes battle or effect damage: They can apply this effect.
● Special Summon 1 Level 4 or lower monster from your hand or Deck, and if you do, you lose 2000 LP.

Into the VRAINS!
Normal Spell Card
Special Summon 1 monster from your hand (but its effects are negated), then, immediately after this effect resolves, Link Summon using that monster you control. This Link Summon cannot be negated, also your opponent cannot activate cards or effects when a monster is Link Summoned this way. If a Link Monster(s) you control is destroyed by battle or card effect while this card is in your GY: You can banish this card; add 1 monster with the same original Type as that monster from your GY to your hand. You can only activate 1 "Into the VRAINS!" per turn.

[The Highlander]

Duel Tower Alcatraz, Duel Academy, Battle Royal Mode – Joining and Into the VRAINS! (I am assuming the summoned monster has to be used for a Link 1) are kind of terrible (although it is funny that they exist).

Ready! Set! Duel! is really good, being another E-Call for Synchrons, while having a Speed Spell - Angel Baton built in for 2 turns later (which is just a bonus, given that the search alone is good enough).

I also cannot point at anything specific, however Overlay Network also looks like a decent card, giving free Xyz Materials from one's graveyard each turn (or bouncing an Xyz Material for a potential searcher/repeating it next turn).