Bloodsky Berserker 1B for a 1/1 that can get +2/+2 anytime you cast your second spell in a turn is potentially quite the beater
The activation cost can be a bit much, so ability cost reducers like Agatha of the Vile Cauldron, Zirda, the Dawnwaker, and Heartstone can at least bring it down to
PGR Premium Gold Rare Fantastical Dragon Phantazmay X DARK Level 7 [ DragonEffect ] ATK 2400 DEF 1800 If your opponent Special Summons a Link Monster(s) (except during the Damage Step): You can Special Summon this card from your hand, draw cards equal to the number of Link Monsters your opponent controls +1, then shuffle cards from your hand into the Deck equal to the number of Link Monsters they control
If you don't control an Army, create a 0/0 black Zombie Army creature token first.) You and permanents you control gain hexproof until end of turn
SR Super Rare The Iris Swordsoul X LIGHT Level 8 [ SpellcasterEffect ] ATK 2500 DEF 2500 During the Main Phase, if a monster, whose effects are negated, is on the field (Quick Effect): You can Special Summon this card from your hand
For collectors who want to store ETBs for 5+ years, acrylics durability ensures the box inside stays protected from physical harm