This means you can't take something like an Alexander Clamilton or an Ass Whuppin' into Standard, Modern, Vintage, Legacy, Pauper, Pioneer, or any other format
While the "legend rule" doesn't apply to Slivers you control, you can control any number of legendary Slivers with the same name and none of them will be put into the graveyard
[BOOSTER XROS ENCOUNTER [BT-10] Box Topper Card reveals] Box Topper reveals begin with BT10-087 Taiki Kudo and BT10-088 Kiriha Aonuma
Goblin Surprise is the major exception, being the perfect option-select spell for this archetype, and obviously Heroic Reinforcements is also a great fit, but thats a shorter list than expected
Also, watch out for chances to use this post-combat after something has been damaged to finish off threats outside of the 5/5 range
TW03-JP022 Dragunity Divine Wind Field Spell You can only use the 1st effect of this cards name once per turn