Colosseum - Cage of the Gladiator Beasts [GLAS-EN054] Rare Plant if you control no monsters:

if you control no monsters: You can Special Summon "Timelord" monsters each from your hand

During your Main Phase: You can Special Summon 1 Level 4 or lower Machine monster from your hand to your zone this card points to

but is unaffected by the effects of other Spell/Trap Cards

Set: Structure Deck: HERO Strike Card type: Quick Play Spell Rarity: Common Target 1 "Hero" monster you control

Colosseum - Cage of the Gladiator Beasts [GLAS-EN054] Rare Plant if you control no monsters:Set: Gladiator's Assault Card type: Field Spell Rarity: Rare Attack: 0 Defense: 0 Place 1 counter on this card each time a monster is Special Summoned from either player's Deck. All "Gladiator Beast" monsters gain 100 ATK and DEF for each of these counters on this card. If this card would be destroyed by a card effect, you can discard 1 "Colosseum Cage of the Gladiator Beasts" to prevent this card from being destroyed.